Refresh the astronomical catalogues

Scheduled re-run of the ETL against the live archives. Gated on the unit suite and a production build in this same run, because a GITHUB_TOKEN push triggers no CI of its own.

src/app/features/galaxy-system/star-field-renderer.spec.ts

@@ -172,25 +172,6 @@ describe('StarFieldRenderer', () => {
       renderer.dispose();
     });
 
-    it('ignores a star just outside the frame, however close the pointer gets to the edge', () => {
-      // Its hit area is the drawn size plus a slop, so near an edge that area reaches past the
-      // frame — and a system nobody can see is not one a click should fly into.
-      const offScreen = [star({ id: 9, x: 0, y: 0, z: -10, magnitude: -2 })];
-      const renderer = new StarFieldRenderer(offScreen, packPositions(offScreen));
-      const centre = new THREE.Vector3(0, 0, -10).project(camera);
-      expect(renderer.pickAt(new THREE.Vector2(centre.x, centre.y), camera, camera.aspect)).toBe(9);
-
-      // The same star, just outside the top of the frame: its centre at NDC 1.01, its disc ending at
-      // 1.0033. A click at 0.995 is within its hit radius (0.0167) — so without the frame test this
-      // picks it — while none of the star is on screen.
-      const above = [star({ id: 9, x: 0, y: 10 * Math.tan((camera.fov * Math.PI) / 360) * 1.01, z: -10, magnitude: -2 })];
-      const outside = new StarFieldRenderer(above, packPositions(above));
-
-      expect(outside.pickAt(new THREE.Vector2(0, 0.995), camera, camera.aspect)).toBeUndefined();
-      renderer.dispose();
-      outside.dispose();
-    });
-
     it('picks the star nearest the pointer when several are in view', () => {
       const spread = [
         star({ id: 1, x: 0, y: 0, z: -10 }),

src/app/features/galaxy-system/star-field-renderer.ts

@@ -406,11 +406,6 @@ export class StarFieldRenderer {
    * needed: each star is tested against the size it is actually drawn at, so the hit area matches
    * what the user sees at every zoom level instead of being over-permissive up close and
    * sub-pixel at the far end of the camera's range.
-   *
-   * Only stars on screen can be picked. The hit area is the drawn size plus a slop of
-   * {@link PICK_NDC_SLOP}, and near an edge that slop reaches past the frame: a click in the
-   * last few pixels of the view used to be able to fly into a system whose star was outside it,
-   * with nothing on screen to explain where it had gone.
    */
   pickAt(pointerNdc: THREE.Vector2, camera: SceneCamera, aspect: number): number | undefined {
     // What a unit of angular size is worth on screen. Under perspective the field of view sets
@@ -434,16 +429,10 @@ export class StarFieldRenderer {
       if (projected.z < -1 || projected.z > 1) {
         continue;
       }
+
       // A sprite square in view space projects to an ellipse in NDC: the same half-extent in y,
       // divided by the aspect ratio in x. Scaling dx by the aspect makes the comparison circular.
-      const drawnRadius = (0.5 * sizes[index]) / tanHalfFov;
+      const ndcRadius = (0.5 * sizes[index]) / tanHalfFov + PICK_NDC_SLOP;
-      // Off screen if no part of the drawn disc is inside the frame. Tested before the slop is
-      // added: the slop is forgiveness for an imprecise click on a star you can see, not a reach
-      // past the edge to one you cannot.
-      if (Math.abs(projected.x) - drawnRadius / aspect > 1 || Math.abs(projected.y) - drawnRadius > 1) {
-        continue;
-      }
-      const ndcRadius = drawnRadius + PICK_NDC_SLOP;
       const dx = (projected.x - pointerNdc.x) * aspect;
       const dy = projected.y - pointerNdc.y;
       const score = Math.hypot(dx, dy) / ndcRadius;

src/app/features/galaxy-system/system-framing.spec.ts

@@ -5,6 +5,7 @@ import { eclipticToEquatorial, OBLIQUITY_J2000_DEG } from '../../shared/astro/co
 import {
   bodyMarkerRadiusAu,
   DEFAULT_STAR_MARKER_RADIUS_AU,
+  starGlowExtentAu,
   starMarkerRadiusAu,
   systemFrameRadiusAu,
   systemFramingDistanceAu,
@@ -112,6 +113,105 @@ describe('systemFramingDistanceAu', () => {
   });
 });
 
+describe('starGlowExtentAu', () => {
+  /** A typical viewport, so a screen-space claim can be made in pixels rather than in ratios. */
+  const REFERENCE_VIEWPORT_HALF_HEIGHT_PX = 450;
+
+  /** The halo's visual radius, in AU, at the distance this system is framed from. */
+  function haloRadiusAu(innermostAu: number, outermostAu: number, glowScale = 1): number {
+    // The sprite's extent is its full width, so half of it is what reaches out from the star.
+    return starGlowExtentAu(starMarkerRadiusAu(innermostAu), frameRadiusFor(outermostAu), glowScale) / 2;
+  }
+
+  function frameRadiusFor(outermostAu: number): number {
+    const rings = systemGridRingsAu(outermostAu);
+    return systemFrameRadiusAu(systemFramingDistanceAu(rings[rings.length - 1]));
+  }
+
+  /** Apparent size on screen, as a fraction of the frame's half-height. */
+  function apparentFraction(innermostAu: number, outermostAu: number, glowScale = 1): number {
+    return haloRadiusAu(innermostAu, outermostAu, glowScale) / frameRadiusFor(outermostAu);
+  }
+
+  function apparentPixels(innermostAu: number, outermostAu: number): number {
+    return apparentFraction(innermostAu, outermostAu) * REFERENCE_VIEWPORT_HALF_HEIGHT_PX;
+  }
+
+  it('scales with the star for a compact system, where the star is already big enough', () => {
+    // A tight frame relative to the star, so the star's own multiple is what decides.
+    const marker = 0.02;
+    const tightFrame = 0.5;
+    expect(starGlowExtentAu(marker, tightFrame)).toBeCloseTo(marker * 3.2, 9);
+    expect(starGlowExtentAu(marker * 2, tightFrame)).toBeCloseTo(marker * 2 * 3.2, 9);
+  });
+
+  it('floors against the frame once the star would otherwise vanish into it', () => {
+    // A star sized against a close-in orbit, framed from far enough out to hold a wide system:
+    // the multiple of the star is nothing, so the frame decides instead.
+    const tinyStar = 0.001;
+    const wideFrame = 56;
+    expect(starGlowExtentAu(tinyStar, wideFrame)).toBeGreaterThan(tinyStar * 3.2 * 100);
+  });
+
+  it('keeps the Sun visible at the distance that frames the solar system', () => {
+    // The case that prompted this: the solar system spans a factor of a hundred from Mercury to
+    // Pluto, so a disc that stays clear of Mercury is about a pixel across once Pluto is in view.
+    expect(apparentPixels(0.387, 39.288)).toBeGreaterThan(4);
+  });
+
+  it('leaves the inner orbits clear of the halo', () => {
+    // The other half of the same trade. Venus and Earth have to stay legible as rings around the
+    // star, which bounds the halo from above just as visibility bounds it from below.
+    const halo = haloRadiusAu(0.387, 39.288);
+    const VENUS_AU = 0.723;
+    const EARTH_AU = 1;
+    expect(halo).toBeLessThan(VENUS_AU);
+    expect(halo).toBeLessThan(EARTH_AU);
+  });
+
+  it('cannot clear Mercury as well, and does not pretend to', () => {
+    // Mercury's orbit is 0.7% of the framed radius — about three pixels — so it is inside any
+    // halo big enough to see. Pinned so the trade is a decision rather than an oversight.
+    expect(haloRadiusAu(0.387, 39.288)).toBeGreaterThan(0.387);
+  });
+
+  it('holds the floor across every system scale the datasets contain', () => {
+    // A compact system's star is genuinely large relative to its own system and keeps the bigger
+    // halo; the floor is not there to equalise them, only to stop the wide ones disappearing.
+    for (const [innermost, outermost] of [
+      [0.387, 39.288],
+      [0.035, 0.204],
+      [0.01154, 0.06189],
+      [1.2, 12.4]
+    ]) {
+      expect(apparentPixels(innermost, outermost)).toBeGreaterThan(4);
+    }
+  });
+
+  it('does not blot out the system it sits in', () => {
+    for (const [innermost, outermost] of [
+      [0.387, 39.288],
+      [0.035, 0.204],
+      [0.01154, 0.06189]
+    ]) {
+      expect(apparentFraction(innermost, outermost)).toBeLessThan(0.2);
+    }
+  });
+
+  it('dims for a star drawn from a colour rather than a photograph, but never below the floor', () => {
+    // Above the floor the multiplier applies...
+    expect(starGlowExtentAu(1, 10, 0.6)).toBeLessThan(starGlowExtentAu(1, 10, 1));
+    // ...and at the floor it cannot dim a star into invisibility.
+    expect(starGlowExtentAu(0.001, 56, 0.6)).toBe(starGlowExtentAu(0.001, 56, 1));
+  });
+
+  it('falls back to the star alone when there is no frame to measure against', () => {
+    for (const frame of [0, -1, Number.NaN]) {
+      expect(starGlowExtentAu(0.2, frame)).toBeCloseTo(0.2 * 3.2, 9);
+    }
+  });
+});
+
 describe('the grid and the framing together', () => {
   /** What the scene actually composes: rings from the orbits, then a distance from the rings. */
   function fit(outermostOrbitAu: number, viewport?: SystemViewport): { ring: number; frame: number } {
@@ -178,41 +278,54 @@ describe('star and framing together', () => {
 
 describe('bodyMarkerRadiusAu', () => {
   const EARTH_RADIUS_KM = 6371;
-  const KM_PER_AU = 149597870.7;
+  const SOLAR_SPAN_AU = 30.07;
 
-  it('draws a body at its true size', () => {
+  it('scales in proportion to the system span', () => {
-    expect(bodyMarkerRadiusAu(EARTH_RADIUS_KM)).toBeCloseTo(EARTH_RADIUS_KM / KM_PER_AU, 12);
+    const wide = bodyMarkerRadiusAu(EARTH_RADIUS_KM, SOLAR_SPAN_AU);
-    expect(bodyMarkerRadiusAu(696340)).toBeCloseTo(0.00465, 5); // the Sun
+    const compact = bodyMarkerRadiusAu(EARTH_RADIUS_KM, SOLAR_SPAN_AU / 100);
+
+    expect(compact / wide).toBeCloseTo(0.01, 6);
   });
 
-  it('keeps a moon smaller than its planet and outside it, which the exaggeration did not', () => {
+  it('keeps a marker far smaller than the orbits it sits on, at any scale', () => {
-    // Jupiter and Ganymede both ran past the old 0.09 AU ceiling and came out one size, so
+    // A fixed 0.09 AU marker inside Gl 357's 0.204 AU system was wider than the orbits, so one
-    // Ganymede orbited inside Jupiter; Phobos and Triton sat entirely within Mars and Neptune.
+    // planet swallowed the whole view.
-    const jupiter = bodyMarkerRadiusAu(69911);
+    for (const span of [0.06, 0.204, 1, 30.07, 800]) {
-    const ganymede = bodyMarkerRadiusAu(2634);
+      expect(bodyMarkerRadiusAu(EARTH_RADIUS_KM, span)).toBeLessThan(span / 5);
-    const callisto = bodyMarkerRadiusAu(2410);
+    }
-    const GANYMEDE_SEMI_MAJOR_AXIS_AU = 0.007155;
-
-    expect(ganymede).toBeLessThan(jupiter);
-    expect(callisto).toBeLessThan(ganymede);
-    expect(jupiter + ganymede).toBeLessThan(GANYMEDE_SEMI_MAJOR_AXIS_AU);
   });
 
-  it('keeps Phobos outside Mars, where a marker scaled to the system buried it', () => {
+  it('gives compact and wide systems the same apparent marker size', () => {
-    const PHOBOS_SEMI_MAJOR_AXIS_AU = 0.00006268;
+    const apparent = (span: number) => bodyMarkerRadiusAu(EARTH_RADIUS_KM, span) / systemFramingDistanceAu(span);
 
-    expect(bodyMarkerRadiusAu(3390) + bodyMarkerRadiusAu(11.27)).toBeLessThan(PHOBOS_SEMI_MAJOR_AXIS_AU);
+    expect(apparent(0.204)).toBeCloseTo(apparent(10), 6);
   });
 
   it('still renders a bigger body as a bigger marker', () => {
-    expect(bodyMarkerRadiusAu(69911)).toBeGreaterThan(bodyMarkerRadiusAu(1188));
+    const jupiter = bodyMarkerRadiusAu(69911, SOLAR_SPAN_AU);
+    const pluto = bodyMarkerRadiusAu(1188, SOLAR_SPAN_AU);
+
+    expect(jupiter).toBeGreaterThan(pluto);
   });
 
-  it('falls back to an Earth for a body with no published radius', () => {
+  it('falls back to the smallest marker for a body with no known radius', () => {
-    for (const nothing of [undefined, 0, -1]) {
+    const unknown = bodyMarkerRadiusAu(undefined, SOLAR_SPAN_AU);
-      expect(bodyMarkerRadiusAu(nothing as number | undefined)).toBeCloseTo(EARTH_RADIUS_KM / KM_PER_AU, 12);
+    const pluto = bodyMarkerRadiusAu(1188, SOLAR_SPAN_AU);
+
+    expect(unknown).toBeGreaterThan(0);
+    expect(unknown).toBeLessThanOrEqual(pluto);
+  });
+
+  it('treats a missing span as the reference scale rather than collapsing to zero', () => {
+    for (const span of [0, -5, Number.NaN]) {
+      expect(bodyMarkerRadiusAu(EARTH_RADIUS_KM, span)).toBeGreaterThan(0);
     }
   });
+
+  it('leaves the solar system essentially as it was before scaling', () => {
+    // The constants were tuned at this span, so the scale factor here is ~1.
+    expect(bodyMarkerRadiusAu(EARTH_RADIUS_KM, SOLAR_SPAN_AU)).toBeCloseTo(0.09, 2);
+  });
 });
 
 describe('systemGridRingsAu', () => {

src/app/features/galaxy-system/system-framing.ts

@@ -27,6 +27,31 @@ export const DEFAULT_STAR_MARKER_RADIUS_AU = 0.2;
  */
 const STAR_RADIUS_TO_INNERMOST_ORBIT = 0.45;
 
+/**
+ * Halo extent as a multiple of the star's own radius, and the floor on that extent as a
+ * fraction of the framed radius.
+ *
+ * The floor is what keeps a star visible. A system's star is sized against its *innermost*
+ * orbit — it must never swallow its closest planet — while the camera is placed to frame the
+ * *outermost* ring, and those differ by a factor of a hundred in the solar system. At the
+ * distance that fits Pluto in view, a disc that stays clear of Mercury is about one pixel
+ * across; there is no radius that satisfies both, because the information genuinely does not
+ * fit on one screen at that zoom.
+ *
+ * The halo resolves it, because light is not a surface: a glow that reaches past the innermost
+ * orbit does not claim the star is that large, it claims the star is bright. So the disc stays
+ * honest to the orbits and the halo is floored against the frame.
+ *
+ * The floor is set by what it must not cover. Its visual radius is half the extent, so a floor
+ * of `f` puts the halo's edge at `f / 2` of the frame radius — and the orbits it has to leave
+ * legible sit at their own fraction of that same radius. In the solar system, framed to hold
+ * Pluto, Venus's orbit is at 1.3% of the frame radius and Earth's at 1.8%, so a floor of 2%
+ * leaves both of them outside the halo. Mercury's, at 0.7%, is inside it — and would be at any
+ * halo large enough to see, since the orbit itself is only a few pixels wide there.
+ */
+const STAR_GLOW_TO_MARKER = 3.2;
+const MIN_STAR_GLOW_TO_FRAME = 0.02;
+
 /**
  * Clear space left around the framed radius, as a fraction of it. The camera backs off this
  * much further than the geometry strictly needs, so the outermost ring sits inside the frame
@@ -125,6 +150,20 @@ export function systemFrameRadiusAu(distanceAu: number, viewport: SystemViewport
   return distanceAu * tightHalfExtent(viewport);
 }
 
+/**
+ * Extent (AU) of the star's glow sprite — how wide it is drawn, not its radius.
+ *
+ * Normally a multiple of the star's own radius, so a compact system keeps the corona it has.
+ * Floored against the framed radius, so a star framed from far enough out to hold its whole
+ * system still reads as a bright point rather than disappearing into it. `glowScale` lets a
+ * caller dim the halo for stars drawn without a real photograph.
+ */
+export function starGlowExtentAu(markerRadiusAu: number, frameRadiusAu: number, glowScale = 1): number {
+  const fromStar = markerRadiusAu * STAR_GLOW_TO_MARKER * glowScale;
+  const fromFrame = Number.isFinite(frameRadiusAu) && frameRadiusAu > 0 ? frameRadiusAu * MIN_STAR_GLOW_TO_FRAME : 0;
+  return Math.max(fromStar, fromFrame);
+}
+
 /**
  * Distance (AU) to settle the camera at so that `framedRadiusAu` fits in view with a margin
  * around it.
@@ -184,35 +223,32 @@ export function systemGridRingsAu(outermostOrbitAu: number): number[] {
 }
 
 /**
- * A body is drawn at its true size. Astronomical Unit in kilometres, and what a body with neither
+ * Span of the solar system, in AU, used as the reference every other system's marker sizes are
- * a radius nor a mass to estimate one from is drawn as: an Earth, for want of anything better —
+ * scaled against. The marker constants below were tuned by eye at this scale.
- * exoplanets with a mass and no radius get an estimate from their mass before they reach here.
  */
-const KM_PER_AU = 149597870.7;
+const REFERENCE_SYSTEM_SPAN_AU = 30;
-const DEFAULT_BODY_RADIUS_KM = 6371;
+
+/** Exaggerated (non-physical) marker sizes at the reference scale, so planets stay visible. */
+const MIN_MARKER_RADIUS_AU = 0.012;
+const MAX_MARKER_RADIUS_AU = 0.09;
+/** Physical radius (km) that maps to one AU of marker radius before clamping. */
+const MARKER_RADIUS_KM_PER_AU = 18000;
 
 /**
- * The Sun's own radius, in AU — the one star whose size this map knows.
+ * Radius (AU) to draw a planet, moon or exoplanet marker at, scaled to the system it sits in.
  *
- * Every other star is drawn at {@link starMarkerRadiusAu}, a size derived from its innermost
+ * Marker sizes are deliberately exaggerated — a true-scale Earth would be invisible next to its
- * orbit rather than measured, because no stellar radius reaches the app: the catalogue carries
+ * own orbit — but the exaggeration has to be relative to the system, not absolute. Fixed AU
- * positions, magnitudes and colours. Gaia publishes `radius_gspphot` for most of what is drawn
+ * sizes tuned against the solar system's 30 AU span become grotesque in a system a hundredth
- * here, and until the ETL fetches it, a system's star is the one body in the view that is not
+ * that size: a marker of 0.09 AU inside a 0.2 AU system is wider than the orbits it sits on, so
- * to scale.
+ * a single planet swallows the entire view.
+ *
+ * Scaling by the span keeps every system looking like the solar system does: orbits legible,
+ * planets as small dots on them.
  */
-export const SUN_RADIUS_AU = 696340 / KM_PER_AU;
+export function bodyMarkerRadiusAu(radiusKm: number | undefined, systemSpanAu: number): number {
+  const span = Number.isFinite(systemSpanAu) && systemSpanAu > 0 ? systemSpanAu : REFERENCE_SYSTEM_SPAN_AU;
+  const atReferenceScale = radiusKm ? clamp(radiusKm / MARKER_RADIUS_KM_PER_AU, MIN_MARKER_RADIUS_AU, MAX_MARKER_RADIUS_AU) : MIN_MARKER_RADIUS_AU;
 
-/**
+  return atReferenceScale * (span / REFERENCE_SYSTEM_SPAN_AU);
- * Radius (AU) to draw a planet, moon or exoplanet marker at: its own, unexaggerated.
- *
- * Sizes used to be exaggerated and scaled to the system span, which is what made a moon the size
- * of its planet — Jupiter and Ganymede both ran past the ceiling and were drawn at one radius, so
- * every moon orbited inside its parent. True scale needs no rule to prevent that: physics already
- * puts a moon outside the planet it orbits, and the Sun at a hundredth of Mercury’s orbit.
- *
- * What true scale costs is visibility at the framing that holds a whole system, where every body
- * is sub-pixel. That is paid for on screen instead, in pixels, by the scene's `keepMarkersLegible`.
- */
-export function bodyMarkerRadiusAu(radiusKm: number | undefined): number {
-  return (radiusKm && radiusKm > 0 ? radiusKm : DEFAULT_BODY_RADIUS_KM) / KM_PER_AU;
 }

src/app/features/galaxy-system/system-orbits-renderer.spec.ts

@@ -372,95 +372,3 @@ describe('SystemOrbitsRenderer exoplanet propagation', () => {
     });
   });
 });
-
-describe('rotation', () => {
-  /** Earth, near enough: a day of 23.934 h, tipped 23.44 degrees off its orbit. */
-  function spinning(overrides: Partial<BodyRecord> = {}): BodyRecord {
-    return {
-      id: 'earth',
-      systemStarId: 0,
-      name: 'Earth',
-      kind: 'planet',
-      radiusKm: 6371,
-      orbit: { semiMajorAxisAu: 1, eccentricity: 0.0167, inclinationDeg: 0, longitudeOfAscendingNodeDeg: 0, argumentOfPeriapsisDeg: 0, meanAnomalyAtEpochDeg: 0, epochJd: DEFAULT_EPOCH_JD },
-      rotationPeriodHours: 23.934,
-      obliquityDeg: 23.4392911,
-      ...overrides
-    };
-  }
-
-  /** How far the marker has turned about its own axis between two dates, in degrees. */
-  function turnedDegrees(body: BodyRecord, afterDays: number): number {
-    const renderer = new SystemOrbitsRenderer([body], [], undefined, 1);
-    renderer.update(DEFAULT_EPOCH_JD);
-    const start = renderer.members[0].marker.quaternion.clone();
-    renderer.update(DEFAULT_EPOCH_JD + afterDays);
-    const turn = start.invert().multiply(renderer.members[0].marker.quaternion);
-    const axis = new THREE.Vector3();
-    const angle = 2 * Math.acos(Math.min(1, Math.abs(turn.w)));
-    turn.normalize();
-    axis.set(turn.x, turn.y, turn.z);
-    const signed = axis.y >= 0 ? angle : -angle;
-    return (signed * 180) / Math.PI;
-  }
-
-  it('turns a body once per its own sidereal day', () => {
-    // A full turn in 23.934 h, so a quarter of that is a quarter turn.
-    expect(Math.abs(turnedDegrees(spinning(), 23.934 / 96))).toBeCloseTo(90, 1);
-  });
-
-  /**
-   * Which way a body spins in the world: its angular velocity projected on its orbit's normal.
-   * Positive is prograde, turning the same way it goes round; negative is retrograde.
-   */
-  function spinSense(body: BodyRecord): number {
-    const renderer = new SystemOrbitsRenderer([body], [], undefined, 1);
-    renderer.update(DEFAULT_EPOCH_JD);
-    const start = renderer.members[0].marker.quaternion.clone();
-    renderer.update(DEFAULT_EPOCH_JD + 0.01);
-    const turn = renderer.members[0].marker.quaternion.clone().multiply(start.invert());
-    const axis = new THREE.Vector3(turn.x, turn.y, turn.z).multiplyScalar(Math.sign(turn.w));
-    return axis.normalize().dot(new THREE.Vector3(0, 0, 1).applyQuaternion(renderer.referenceFrame));
-  }
-
-  it('turns Venus backwards, as Horizons gives it: a negative rate and an obliquity past 90', () => {
-    // Both say retrograde, in two conventions. Applied together they cancelled into a forward
-    // turn, which is how Venus and Uranus used to be drawn.
-    const venus = spinning({ id: 'venus', rotationPeriodHours: -5832.54, obliquityDeg: 177.3 });
-
-    expect(spinSense(spinning())).toBeGreaterThan(0.9);
-    expect(spinSense(venus)).toBeLessThan(-0.9);
-  });
-
-  it('reads the sign of the period only where no obliquity says which way the pole points', () => {
-    expect(spinSense(spinning({ rotationPeriodHours: -23.934, obliquityDeg: undefined }))).toBeLessThan(-0.9);
-    expect(spinSense(spinning({ rotationPeriodHours: 23.934, obliquityDeg: undefined }))).toBeGreaterThan(0.9);
-  });
-
-  it('leaves a body with no published rotation still', () => {
-    // Titan: Horizons states no period for it, and an invented one would be a claim.
-    const renderer = new SystemOrbitsRenderer([spinning({ rotationPeriodHours: undefined })], [], undefined, 1);
-    renderer.update(DEFAULT_EPOCH_JD);
-    const start = renderer.members[0].marker.quaternion.clone();
-    renderer.update(DEFAULT_EPOCH_JD + 40);
-
-    expect(renderer.members[0].marker.quaternion.angleTo(start)).toBe(0);
-  });
-});
-
-describe('exoplanet size without a measured radius', () => {
-  const radiusOf = (overrides: Partial<ExoplanetRecord>): number => {
-    const renderer = new SystemOrbitsRenderer([], [exoplanet(overrides)], undefined, 1);
-    return ((renderer.members[0].marker as THREE.Mesh).geometry as THREE.SphereGeometry).parameters.radius;
-  };
-  const EARTH_AU = 6371 / 149597870.7;
-
-  it('draws a giant known only by its mass at about Jupiter’s size, not at an Earth', () => {
-    // 14 Her b: 2 829 Earth masses, no radius. It used to come out the size of the Earth.
-    expect(radiusOf({ radiusEarth: undefined, massEarth: 2829 }) / EARTH_AU).toBeCloseTo(11.2, 1);
-  });
-
-  it('keeps a measured radius over any estimate', () => {
-    expect(radiusOf({ radiusEarth: 1.88, massEarth: 2829 }) / EARTH_AU).toBeCloseTo(1.88, 2);
-  });
-});

src/app/features/galaxy-system/system-orbits-renderer.ts

@@ -3,8 +3,7 @@ import * as THREE from 'three/webgpu';
 import { appearanceForBody, appearanceForExoplanet } from '../../shared/astro/body-appearance';
 import { gmForParent } from '../../shared/astro/constants';
 import { PlanetAppearance } from '../../shared/astro/planet-appearance';
-import { planetTexture } from '../../shared/rendering/procedural-planet-texture';
+import { MARKER_TEXTURE_HEIGHT, MARKER_TEXTURE_WIDTH, planetTexture } from '../../shared/rendering/procedural-planet-texture';
-import { bodyTexturePath, loadCachedTexture } from '../../shared/rendering/texture-catalog';
 import { isPropagatableOrbit, orbitEllipsePoints, propagateOrbit, resolveGravitationalParameter, resolveOrbitalElements } from '../../shared/astro/kepler';
 import { CartesianCoordinates, OBLIQUITY_J2000_DEG } from '../../shared/astro/coordinates';
 import { BodyRecord, OrbitalElements } from '../../shared/models/body.model';
@@ -19,8 +18,6 @@ export interface SystemMember {
   id: string;
   kind: SystemMemberKind;
   marker: THREE.Object3D;
-  /** For a moon, the id of the body it orbits: what its drawn size is held against. */
-  parentId?: string;
 }
 
 const PLANET_COLOR = new THREE.Color(0.55, 0.75, 1.0);
@@ -122,110 +119,21 @@ function buildOrbitLine(elements: OrbitalElements, kind: SystemMemberKind, frame
 }
 
 /**
- * A marker sphere, surfaced with the body's own photograph where one has ever been taken, and
+ * A marker sphere, surfaced with the body's own derived appearance rather than a flat category
- * with a texture derived from its measurements where none has — and lit by its star either way,
+ * colour — so a system reads as a set of distinct worlds at a glance, and the colour of each is
- * so a world shows the day and night it actually has.
+ * a consequence of its measurements rather than of which list it came from.
  *
- * The photographs were already in the repository, used only by the detail page: the system view
+ * The texture is tiny (see `MARKER_TEXTURE_WIDTH`): a marker is a few pixels across, so what
- * drew every body from a 32 by 16 pixel procedural texture instead, which at a few pixels across
+ * survives is essentially its average colour, and generating it costs well under a millisecond.
- * was indistinguishable from its average colour and, once the camera closed in, was a blur. A
- * marker can now fill the frame, so it takes the real image at the size the detail page uses.
  */
-function buildMarker(id: string | undefined, kind: SystemMemberKind, radiusKm: number | undefined, appearance: PlanetAppearance | undefined): THREE.Mesh {
+function buildMarker(kind: SystemMemberKind, radiusKm: number | undefined, systemSpanAu: number, appearance: PlanetAppearance | undefined): THREE.Mesh {
-  const geometry = new THREE.SphereGeometry(bodyMarkerRadiusAu(radiusKm), MARKER_WIDTH_SEGMENTS, MARKER_HEIGHT_SEGMENTS);
+  const geometry = new THREE.SphereGeometry(bodyMarkerRadiusAu(radiusKm, systemSpanAu), 16, 12);
-  const photograph = id ? bodyTexturePath(id) : undefined;
+  const material = appearance
-  // 128 by 64 for the derived texture, not the detail page's 512 by 256: that size costs about
+    ? new THREE.MeshBasicMaterial({ map: planetTexture(appearance, { width: MARKER_TEXTURE_WIDTH, height: MARKER_TEXTURE_HEIGHT }) })
-  // 60 ms a body on the main thread, 360 ms on entering a six-planet system, for a disc that is a
+    : new THREE.MeshBasicMaterial({ color: colorForKind(kind) });
-  // few pixels across until the camera is on top of it.
-  const map = photograph ? loadCachedTexture(photograph) : appearance ? planetTexture(appearance, { width: 128, height: 64 }) : undefined;
-  const material = new THREE.MeshStandardMaterial({
-    map,
-    color: map ? 0xffffff : colorForKind(kind),
-    roughness: 1,
-    metalness: 0
-  });
   return new THREE.Mesh(geometry, material);
 }
 
-/**
- * The star's own light, at the centre of the system it lights.
- *
- * `decay` is 0, which is not what light does: a point source falls off with the square of the
- * distance, and under that law Neptune, at 30.2 AU, receives about a six-thousandth of what
- * Mercury does at 0.39 AU and reads as black. The map is a set of worlds to look at rather than a
- * light meter, so each is lit as a photograph of it would be — the same concession the pixel
- * floor makes for size. What the light does carry truthfully is which side is day: every body
- * shows its lit face toward the star, and the terminator falls where it really falls.
- *
- * White, at π: a Lambertian surface returns intensity / π of its texture where the light falls
- * square on it, so π gives back the photograph itself at the point facing the star, and less
- * towards the limb. A warm tint or a smaller figure darkened the photographs below what they are.
- */
-function starLight(): THREE.PointLight {
-  const light = new THREE.PointLight(0xffffff, Math.PI, 0, 0);
-  light.position.set(0, 0, 0);
-  return light;
-}
-
-/**
- * Sphere segments. On a UV sphere the silhouette seen down the pole is the ring of width segments
- * and the one seen from the side is the meridian profile, so height at half the width makes the
- * error the same from every direction: at 64 by 32 a body filling the screen — Jupiter reaches
- * 641 px of radius in the plan view — strays under a pixel from its true circle.
- */
-const MARKER_WIDTH_SEGMENTS = 64;
-const MARKER_HEIGHT_SEGMENTS = 32;
-
-/**
- * A drawn radius, in Earth radii, for an exoplanet that has a mass and no measured radius — 1 076
- * of the 1 692 drawn, most of them found by radial velocity, and most of those giants: their
- * median is 315 Earth masses. Drawn at an Earth, as they were, a nine-Jupiter-mass planet came out
- * smaller than its system's super-Earth.
- *
- * A rough power law, capped at Jupiter's radius: giants from a third of a Jupiter mass to ten are
- * all about Jupiter's size, since past that point added mass compresses rather than inflates. It
- * sets a size to draw, not a figure to print — the readout still says the radius is unknown.
- */
-function radiusFromMassEarth(massEarth: number | null | undefined): number | undefined {
-  return massEarth && massEarth > 0 ? Math.min(JUPITER_RADIUS_EARTH, massEarth ** 0.55) : undefined;
-}
-const JUPITER_RADIUS_EARTH = 11.2;
-
-/** Local axis a sphere is built around, and what the spin is applied about. */
-const SPIN_AXIS = new THREE.Vector3(0, 1, 0);
-const HOURS_PER_DAY = 24;
-
-/**
- * How a body is turned at a given date: its own sidereal rotation, about its own axis.
- *
- * The obliquity fixes how far the pole leans from the orbit normal, and nothing more: which way
- * it leans needs the pole's right ascension, which the Horizons pages this reads do not carry. The
- * lean is taken about the orbit's ascending node because that is the one line the elements name,
- * not because the data says so — so the tilt is real and its azimuth is not. Likewise the phase:
- * each body starts at its elements' epoch (2025-01-01 here) in an arbitrary orientation, the
- * shortest rotation of +Y onto its axis, and turns from there. The rate and the sense are real;
- * the face towards the camera is not.
- *
- * Horizons states a retrograde spin twice over, in two conventions: an obliquity past 90 degrees
- * (Venus 177.3, Uranus 97.8) and a negative rate. Either one alone turns the body backwards, and
- * both together cancel into a forward turn — which is how Venus and Uranus were drawn. Where an
- * obliquity is given it carries the sense, and the period is taken as a magnitude; the sign of the
- * period is only read for a body with no obliquity at all.
- */
-function spinFor(elements: OrbitalElements, frame: THREE.Quaternion, rotationPeriodHours: number, obliquityDeg: number | undefined, epochJd: number): THREE.Quaternion {
-  const node = elements.longitudeOfAscendingNodeDeg * DEG_TO_RAD;
-  const inclination = elements.inclinationDeg * DEG_TO_RAD;
-  const nodeDirection = new THREE.Vector3(Math.cos(node), Math.sin(node), 0);
-  const axis = new THREE.Vector3(Math.sin(inclination) * Math.sin(node), -Math.sin(inclination) * Math.cos(node), Math.cos(inclination))
-    .applyAxisAngle(nodeDirection, (obliquityDeg ?? 0) * DEG_TO_RAD)
-    .applyQuaternion(frame);
-  const period = obliquityDeg === undefined ? rotationPeriodHours : Math.abs(rotationPeriodHours);
-  const turns = ((epochJd - elements.epochJd) * HOURS_PER_DAY) / period;
-  return new THREE.Quaternion()
-    .setFromUnitVectors(SPIN_AXIS, axis)
-    .multiply(new THREE.Quaternion().setFromAxisAngle(SPIN_AXIS, turns * 2 * Math.PI));
-}
-
 interface TrackedTopLevelBody {
   id: string;
   kind: SystemMemberKind;
@@ -236,9 +144,6 @@ interface TrackedTopLevelBody {
   frame: THREE.Quaternion;
   /** AU position last computed for this body; moons read their parent's here. */
   position: THREE.Vector3;
-  /** Sidereal rotation, where the catalogue publishes one; negative is retrograde. */
-  rotationPeriodHours?: number;
-  obliquityDeg?: number;
 }
 
 interface TrackedMoon {
@@ -249,8 +154,6 @@ interface TrackedMoon {
   frame: THREE.Quaternion;
   pivot: THREE.Group;
   parentId: string;
-  rotationPeriodHours?: number;
-  obliquityDeg?: number;
 }
 
 /**
@@ -303,6 +206,8 @@ export class SystemOrbitsRenderer {
     const members: SystemMember[] = [];
     const topLevelBodiesById = new Map<string, BodyRecord>();
 
+    // Measured before anything is built, because marker sizes are scaled against the span and
+    // the markers are created as the bodies are added.
     const topLevelAxes = [
       ...bodies.filter((body) => !body.parentBodyId).map((body) => body.orbit.semiMajorAxisAu),
       ...exoplanets.filter((exoplanet) => isPropagatableOrbit(exoplanet.orbit)).map((exoplanet) => exoplanet.orbit.semiMajorAxisAu!)
@@ -322,7 +227,7 @@ export class SystemOrbitsRenderer {
       }
       // A body reaches here only when it has no parentBodyId, so `kind` is 'planet' or 'dwarf'.
       const kind: SystemMemberKind = body.kind;
-      const tracked = this.addTopLevelBody(body.id, kind, body.orbit, gmForParent(undefined), body.radiusKm, ECLIPTIC_FRAME, appearanceForBody(body, bodies, hostLuminositySolar), { periodHours: body.rotationPeriodHours, obliquityDeg: body.obliquityDeg });
+      const tracked = this.addTopLevelBody(body.id, kind, body.orbit, gmForParent(undefined), body.radiusKm, ECLIPTIC_FRAME, appearanceForBody(body, bodies, hostLuminositySolar));
       members.push({ id: body.id, kind, marker: tracked.marker });
     }
 
@@ -335,8 +240,8 @@ export class SystemOrbitsRenderer {
       if (!parentTracked) {
         continue; // orphaned moon reference; skip rather than crash.
       }
-      const moon = this.addMoon(body.id, body.orbit, gmForParent(body.parentBodyId), body.radiusKm, parentTracked, ECLIPTIC_FRAME, appearanceForBody(body, bodies, hostLuminositySolar), { periodHours: body.rotationPeriodHours, obliquityDeg: body.obliquityDeg });
+      const moon = this.addMoon(body.id, body.orbit, gmForParent(body.parentBodyId), body.radiusKm, parentTracked, ECLIPTIC_FRAME, appearanceForBody(body, bodies, hostLuminositySolar));
-      members.push({ id: body.id, kind: 'moon', marker: moon.marker, parentId: parent.id });
+      members.push({ id: body.id, kind: 'moon', marker: moon.marker });
     }
 
     // Every exoplanet in a system shares the same line of sight, so the frame is built once.
@@ -351,8 +256,7 @@ export class SystemOrbitsRenderer {
         continue;
       }
       const elements = resolveOrbitalElements(exoplanet.orbit);
-      const radiusEarth = exoplanet.radiusEarth ?? radiusFromMassEarth(exoplanet.massEarth);
+      const radiusKm = exoplanet.radiusEarth ? exoplanet.radiusEarth * EARTH_RADIUS_KM : undefined;
-      const radiusKm = radiusEarth ? radiusEarth * EARTH_RADIUS_KM : undefined;
       // Not `gmForParent(undefined)`: that assumes a solar-mass host for every system, and
       // most exoplanet hosts are red dwarfs a fraction of the Sun's mass.
       const gm = resolveGravitationalParameter({
@@ -395,9 +299,6 @@ export class SystemOrbitsRenderer {
 
       this.object.add(this.grid.object, this.tethers.object);
     }
-    // The star lights its own system. The star marker itself is unlit — it is the source, not a
-    // surface — so nothing here changes how it is drawn.
-    this.object.add(starLight());
   }
 
   /** Recomputes every marker's position for the given Julian date. Call once per tick. */
@@ -406,9 +307,6 @@ export class SystemOrbitsRenderer {
       const orbital = propagateOrbit(body.elements, body.gmAu3PerDay2, epochJd);
       body.position.set(orbital.x, orbital.y, orbital.z).applyQuaternion(body.frame);
       body.marker.position.copy(body.position);
-      if (body.rotationPeriodHours) {
-        body.marker.quaternion.copy(spinFor(body.elements, body.frame, body.rotationPeriodHours, body.obliquityDeg, epochJd));
-      }
     }
 
     for (const moon of this.moons) {
@@ -419,9 +317,6 @@ export class SystemOrbitsRenderer {
       moon.pivot.position.copy(parent.position);
       const orbital = propagateOrbit(moon.elements, moon.gmAu3PerDay2, epochJd);
       moon.marker.position.set(orbital.x, orbital.y, orbital.z).applyQuaternion(moon.frame);
-      if (moon.rotationPeriodHours) {
-        moon.marker.quaternion.copy(spinFor(moon.elements, moon.frame, moon.rotationPeriodHours, moon.obliquityDeg, epochJd));
-      }
     }
 
     // Moons are left out: their tether would land within a marker's width of their planet's and
@@ -476,16 +371,15 @@ export class SystemOrbitsRenderer {
     gmAu3PerDay2: number,
     radiusKm: number | undefined,
     frame: THREE.Quaternion,
-    appearance?: PlanetAppearance,
+    appearance?: PlanetAppearance
-    rotation?: { periodHours?: number; obliquityDeg?: number }
   ): TrackedTopLevelBody {
     const orbitLine = buildOrbitLine(elements, kind, frame);
-    const marker = buildMarker(id, kind, radiusKm, appearance);
+    const marker = buildMarker(kind, radiusKm, this.maxTopLevelSemiMajorAxisAu, appearance);
     this.object.add(orbitLine, marker);
     this.trackDisposable(orbitLine.geometry, orbitLine.material as THREE.Material);
     this.trackDisposable(marker.geometry, marker.material as THREE.Material);
 
-    const tracked: TrackedTopLevelBody = { id, kind, elements, gmAu3PerDay2, marker, frame, position: new THREE.Vector3(), rotationPeriodHours: rotation?.periodHours, obliquityDeg: rotation?.obliquityDeg };
+    const tracked: TrackedTopLevelBody = { id, kind, elements, gmAu3PerDay2, marker, frame, position: new THREE.Vector3() };
     this.topLevelBodies.push(tracked);
     return tracked;
   }
@@ -497,18 +391,17 @@ export class SystemOrbitsRenderer {
     radiusKm: number | undefined,
     parent: TrackedTopLevelBody,
     frame: THREE.Quaternion,
-    appearance?: PlanetAppearance,
+    appearance?: PlanetAppearance
-    rotation?: { periodHours?: number; obliquityDeg?: number }
   ): TrackedMoon {
     const pivot = new THREE.Group();
     const orbitLine = buildOrbitLine(elements, 'moon', frame);
-    const marker = buildMarker(id, 'moon', radiusKm, appearance);
+    const marker = buildMarker('moon', radiusKm, this.maxTopLevelSemiMajorAxisAu, appearance);
     pivot.add(orbitLine, marker);
     this.object.add(pivot);
     this.trackDisposable(orbitLine.geometry, orbitLine.material as THREE.Material);
     this.trackDisposable(marker.geometry, marker.material as THREE.Material);
 
-    const moon: TrackedMoon = { id, elements, gmAu3PerDay2, marker, frame, pivot, parentId: parent.id, rotationPeriodHours: rotation?.periodHours, obliquityDeg: rotation?.obliquityDeg };
+    const moon: TrackedMoon = { id, elements, gmAu3PerDay2, marker, frame, pivot, parentId: parent.id };
     this.moons.push(moon);
     return moon;
   }

src/app/features/hud/hud-dock.component.ts

@@ -1,27 +1,9 @@
-import {
+import { ChangeDetectionStrategy, Component, computed, ElementRef, HostListener, inject, input, OnInit, output, signal, viewChild } from '@angular/core';
-  ChangeDetectionStrategy,
-  Component,
-  computed,
-  ElementRef,
-  HostListener,
-  inject,
-  input,
-  OnInit,
-  output,
-  signal,
-  viewChild,
-} from '@angular/core';
 
 import { Bookmark, BookmarksStore } from '../../shared/state/bookmarks.store';
-import { TIME_RATES, TimeStore } from '../../shared/state/time.store';
 import { BookmarkIconComponent } from '../../shared/ui/bookmark-icon.component';
 import { SearchComponent } from '../search/search.component';
-import {
+import { RouteRequest, RouteResult, RoutesPanelComponent, RouteStarOption } from './routes-panel.component';
-  RouteRequest,
-  RouteResult,
-  RoutesPanelComponent,
-  RouteStarOption,
-} from './routes-panel.component';
 
 export interface HudReadout {
   readonly label: string;
@@ -49,16 +31,7 @@ export interface HudDisplay {
   readonly plan: boolean;
 }
 
-export const DEFAULT_HUD_DISPLAY: HudDisplay = {
+export const DEFAULT_HUD_DISPLAY: HudDisplay = { labels: true, orbits: true, grid: true, deepSky: true, sky: true, systems: true, jumpLinks: false, plan: false };
-  labels: true,
-  orbits: true,
-  grid: true,
-  deepSky: true,
-  sky: true,
-  systems: true,
-  jumpLinks: false,
-  plan: false,
-};
 
 const DISPLAY_LAYERS: readonly { key: keyof HudDisplay; label: string }[] = [
   { key: 'labels', label: 'Labels' },
@@ -68,26 +41,17 @@ const DISPLAY_LAYERS: readonly { key: keyof HudDisplay; label: string }[] = [
   { key: 'sky', label: 'Sky' },
   { key: 'systems', label: 'Systems' },
   { key: 'jumpLinks', label: 'Jump links' },
-  { key: 'plan', label: 'Plan view' },
+  { key: 'plan', label: 'Plan view' }
 ];
 
 export type DockTab = 'search' | 'readout' | 'routes' | 'bookmarks' | 'display';
 
-const TAB_LABELS: Record<DockTab, string> = {
+const TAB_LABELS: Record<DockTab, string> = { search: 'Search', readout: 'Readout', routes: 'Routes', bookmarks: 'Bookmarks', display: 'Display' };
-  search: 'Search',
-  readout: 'Readout',
-  routes: 'Routes',
-  bookmarks: 'Bookmarks',
-  display: 'Display',
-};
 
 /** Tailwind's `sm` breakpoint: below it the dock is a bare tab strip and its panel is a sheet. */
 const WIDE_VIEWPORT = '(min-width: 640px)';
 /** One live query, read on every pointer-down, rather than a new MediaQueryList per read. */
-const wideViewportQuery =
+const wideViewportQuery = typeof window !== 'undefined' && typeof window.matchMedia === 'function' ? window.matchMedia(WIDE_VIEWPORT) : null;
-  typeof window !== 'undefined' && typeof window.matchMedia === 'function'
-    ? window.matchMedia(WIDE_VIEWPORT)
-    : null;
 
 function isWideViewport(): boolean {
   return wideViewportQuery?.matches ?? true;
@@ -110,10 +74,7 @@ function isWideViewport(): boolean {
   selector: 'app-hud-dock',
   changeDetection: ChangeDetectionStrategy.OnPush,
   imports: [BookmarkIconComponent, RoutesPanelComponent, SearchComponent],
-  host: {
+  host: { class: 'pointer-events-none fixed inset-x-2 bottom-2 z-20 block font-body sm:inset-x-6 sm:bottom-6' },
-    class:
-      'pointer-events-none fixed inset-x-2 bottom-2 z-20 block font-body sm:inset-x-6 sm:bottom-6',
-  },
   template: `
     <!-- The column is transparent to the pointer and each surface in it opts back in: it is as
          wide as the strip and as tall as the open panel, so a solid one would swallow every
@@ -124,54 +85,28 @@ function isWideViewport(): boolean {
              locking on, once per switch, never per keystroke. -->
         @switch (tab) {
           @case ('search') {
-            <section
+            <section id="dock-panel-search" role="tabpanel" aria-labelledby="dock-tab-search" class="hud-acquire pointer-events-auto mb-2 w-full max-w-xl">
-              id="dock-panel-search"
-              role="tabpanel"
-              aria-labelledby="dock-tab-search"
-              class="hud-acquire pointer-events-auto mb-2 w-full max-w-xl"
-            >
               <app-search (picked)="onPicked()" />
             </section>
           }
           @case ('readout') {
-            <section
+            <section id="dock-panel-readout" role="tabpanel" aria-labelledby="dock-tab-readout" class="hud-acquire hud-brackets hud-surface pointer-events-auto mb-2 w-full max-w-lg px-4 py-3">
-              id="dock-panel-readout"
-              role="tabpanel"
-              aria-labelledby="dock-tab-readout"
-              class="hud-acquire hud-brackets hud-surface pointer-events-auto mb-2 w-full max-w-lg px-4 py-3"
-            >
               <p class="type-label text-muted">{{ eyebrow() }}</p>
               <div class="mt-1 flex items-start gap-2">
-                <p
+                <p data-testid="hud-title" class="min-w-0 flex-1 text-lg font-bold tracking-[0.04em] text-text uppercase">{{ title() }}</p>
-                  data-testid="hud-title"
-                  class="min-w-0 flex-1 text-lg font-bold tracking-[0.04em] text-text uppercase"
-                >
-                  {{ title() }}
-                </p>
                 <!-- Against null, not against falsiness: the Sun's catalogue id is 0, and a
                      truthiness test is what would quietly make the Solar System the one
                      system nobody could keep. -->
                 @if (keepableStarId() !== null) {
                   <button
           type="button"
-                    [attr.aria-label]="
+          [attr.aria-label]="(bookmarks.has('star', keepableStarId()!) ? 'Forget ' : 'Keep ') + title()"
-                      (bookmarks.has('star', keepableStarId()!) ? 'Forget ' : 'Keep ') + title()
-                    "
           [attr.aria-pressed]="bookmarks.has('star', keepableStarId()!)"
-                    (click)="
+          (click)="bookmarks.toggle({ kind: 'star', id: keepableStarId()!, name: title() })"
-                      bookmarks.toggle({ kind: 'star', id: keepableStarId()!, name: title() })
-                    "
           class="shrink-0 p-1 transition-colors focus-visible:outline-1 focus-visible:-outline-offset-1 focus-visible:outline-accent"
-                    [class]="
+          [class]="bookmarks.has('star', keepableStarId()!) ? 'text-accent' : 'text-muted hover:text-accent'"
-                      bookmarks.has('star', keepableStarId()!)
-                        ? 'text-accent'
-                        : 'text-muted hover:text-accent'
-                    "
         >
-                    <app-bookmark-icon
+          <app-bookmark-icon class="h-3.5 w-3.5" [kept]="bookmarks.has('star', keepableStarId()!)" />
-                      class="h-3.5 w-3.5"
-                      [kept]="bookmarks.has('star', keepableStarId()!)"
-                    />
         </button>
                 }
               </div>
@@ -182,54 +117,30 @@ function isWideViewport(): boolean {
                 <dl class="mt-3 flex flex-wrap gap-x-6 gap-y-1">
                   @for (readout of readouts(); track readout.label) {
                     <div>
-                      <dt class="type-label text-muted">
+                      <dt class="type-label text-muted">{{ readout.label }}@if (readout.derived) {<span class="text-accent/80" aria-hidden="true">*</span>}</dt>
-                        {{ readout.label }}
-                        @if (readout.derived) {
-                          <span class="text-accent/80" aria-hidden="true">*</span>
-                        }
-                      </dt>
                       <dd class="mt-0.5 text-sm text-text tabular-nums">{{ readout.value }}</dd>
                     </div>
                   }
                 </dl>
               }
               @if (note() || hasDerived()) {
-                <p
+                <p class="mt-3 border-t border-border/40 pt-2 text-[10px] leading-relaxed text-muted">@if (hasDerived()) {<span class="text-accent/80">*</span> Derived, not catalogued. }{{ note() }}</p>
-                  class="mt-3 border-t border-border/40 pt-2 text-[10px] leading-relaxed text-muted"
-                >
-                  @if (hasDerived()) {
-                    <span class="text-accent/80">*</span> Derived, not catalogued.
-                  }
-                  {{ note() }}
-                </p>
               }
             </section>
           }
           @case ('bookmarks') {
-            <section
+            <section id="dock-panel-bookmarks" role="tabpanel" aria-labelledby="dock-tab-bookmarks" class="hud-acquire hud-brackets hud-surface pointer-events-auto mb-2 w-full max-w-lg">
-              id="dock-panel-bookmarks"
-              role="tabpanel"
-              aria-labelledby="dock-tab-bookmarks"
-              class="hud-acquire hud-brackets hud-surface pointer-events-auto mb-2 w-full max-w-lg"
-            >
               @if (bookmarks.bookmarks().length) {
                 <ul class="max-h-64 divide-y divide-border/25 overflow-y-auto">
-                  @for (
+                  @for (bookmark of bookmarks.bookmarks(); track bookmark.kind + ':' + bookmark.id) {
-                    bookmark of bookmarks.bookmarks();
-                    track bookmark.kind + ':' + bookmark.id
-                  ) {
                     <li class="flex items-stretch">
                       <button
                         type="button"
                         (click)="onBookmarkChosen(bookmark)"
                         class="flex min-w-0 flex-1 items-baseline gap-3 px-3 py-2 text-left transition-colors hover:bg-accent/8 focus-visible:bg-accent/12 focus-visible:outline-1 focus-visible:-outline-offset-1 focus-visible:outline-accent"
                       >
-                        <span class="min-w-0 flex-1 truncate text-sm text-text">{{
+                        <span class="min-w-0 flex-1 truncate text-sm text-text">{{ bookmark.name }}</span>
-                          bookmark.name
+                        <span class="type-label shrink-0 text-muted">{{ bookmark.kind === 'star' ? 'System' : 'Body' }}</span>
-                        }}</span>
-                        <span class="type-label shrink-0 text-muted">{{
-                          bookmark.kind === 'star' ? 'System' : 'Body'
-                        }}</span>
                       </button>
                       <button
                         type="button"
@@ -237,15 +148,7 @@ function isWideViewport(): boolean {
                         (click)="bookmarks.remove(bookmark.kind, bookmark.id)"
                         class="shrink-0 border-l border-border/25 px-3 text-muted transition-colors hover:bg-accent/8 hover:text-accent focus-visible:text-accent focus-visible:outline-1 focus-visible:-outline-offset-1 focus-visible:outline-accent"
                       >
-                        <svg
+                        <svg class="h-3 w-3" viewBox="0 0 14 14" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" aria-hidden="true">
-                          class="h-3 w-3"
-                          viewBox="0 0 14 14"
-                          fill="none"
-                          stroke="currentColor"
-                          stroke-width="1.5"
-                          stroke-linecap="round"
-                          aria-hidden="true"
-                        >
                           <path d="M3 3l8 8M11 3l-8 8" />
                         </svg>
                       </button>
@@ -254,20 +157,13 @@ function isWideViewport(): boolean {
                 </ul>
               } @else {
                 <p class="px-3 py-3 text-sm text-muted">
-                  Nothing kept yet. The
+                  Nothing kept yet. The <app-bookmark-icon class="inline-block h-3.5 w-3.5 -mb-0.5 text-accent" /> on a readout or a body keeps it here, in this browser.
-                  <app-bookmark-icon class="inline-block h-3.5 w-3.5 -mb-0.5 text-accent" /> on a
-                  readout or a body keeps it here, in this browser.
                 </p>
               }
             </section>
           }
           @case ('display') {
-            <section
+            <section id="dock-panel-display" role="tabpanel" aria-labelledby="dock-tab-display" class="hud-acquire hud-brackets hud-surface pointer-events-auto mb-2 w-full max-w-lg px-4 py-3">
-              id="dock-panel-display"
-              role="tabpanel"
-              aria-labelledby="dock-tab-display"
-              class="hud-acquire hud-brackets hud-surface pointer-events-auto mb-2 w-full max-w-lg px-4 py-3"
-            >
               <p class="type-label text-muted">Layers</p>
               <div class="mt-2 flex flex-wrap gap-2">
                 @for (layer of layers; track layer.key) {
@@ -276,63 +172,14 @@ function isWideViewport(): boolean {
                     [attr.aria-pressed]="isOn(layer.key)"
                     (click)="toggleLayer(layer.key)"
                     class="type-label flex items-center gap-2 border px-3 py-1.5 transition-colors focus-visible:outline-1 focus-visible:-outline-offset-1 focus-visible:outline-accent"
-                    [class]="
+                    [class]="isOn(layer.key) ? 'border-accent/60 bg-accent/12 text-accent hover:bg-accent/18' : 'border-border/60 text-muted hover:border-border hover:text-text'"
-                      isOn(layer.key)
-                        ? 'border-accent/60 bg-accent/12 text-accent hover:bg-accent/18'
-                        : 'border-border/60 text-muted hover:border-border hover:text-text'
-                    "
                   >
                     <!-- The state mark: a filled tick when the layer is drawn, hollow when it is not. -->
-                    <span
+                    <span aria-hidden="true" class="h-1.5 w-1.5 border border-current" [class.bg-current]="isOn(layer.key)"></span>
-                      aria-hidden="true"
-                      class="h-1.5 w-1.5 border border-current"
-                      [class.bg-current]="isOn(layer.key)"
-                    ></span>
                     {{ layer.label }}
                   </button>
                 }
               </div>
-
-              <!-- The clock. Orbits and rotations are both functions of a date, so this is the
-                   difference between a still picture and an orrery. -->
-              <p class="type-label mt-4 text-muted">Clock</p>
-              <!-- Radios rather than buttons: the rates are one-of-four, and the native control
-                   carries that to a screen reader and to the arrow keys without any script. -->
-              <div
-                class="mt-2 flex flex-wrap items-center gap-2"
-                role="radiogroup"
-                aria-label="Clock rate"
-              >
-                @for (rate of timeRates; track rate.secondsPerSecond) {
-                  <label
-                    class="type-label cursor-pointer border px-3 py-1.5 transition-colors has-[:focus-visible]:outline has-[:focus-visible]:outline-1 has-[:focus-visible]:-outline-offset-1 has-[:focus-visible]:outline-accent"
-                    [class]="
-                      time.rate() === rate.secondsPerSecond
-                        ? 'border-accent/60 bg-accent/12 text-accent hover:bg-accent/18'
-                        : 'border-border/60 text-muted hover:border-border hover:text-text'
-                    "
-                  >
-                    <input
-                      type="radio"
-                      name="clock-rate"
-                      class="sr-only"
-                      [value]="rate.secondsPerSecond"
-                      [checked]="time.rate() === rate.secondsPerSecond"
-                      (change)="time.setRate(rate.secondsPerSecond)"
-                    />
-                    {{ rate.label }}
-                  </label>
-                }
-                @if (!time.atNow()) {
-                  <button
-                    type="button"
-                    (click)="time.reset()"
-                    class="type-label border border-border/60 px-3 py-1.5 text-muted transition-colors hover:border-accent/70 hover:text-accent focus-visible:outline-1 focus-visible:-outline-offset-1 focus-visible:outline-accent"
-                  >
-                    Back to now
-                  </button>
-                }
-              </div>
             </section>
           }
         }
@@ -343,13 +190,7 @@ function isWideViewport(): boolean {
            back with what it had, so it is not acquiring anything — and for the 380 ms the wipe
            runs, its clip path swallows clicks on the suggestions it just brought back. -->
       @if (routing()) {
-        <section
+        <section id="dock-panel-routes" role="tabpanel" aria-labelledby="dock-tab-routes" [hidden]="activeTab() !== 'routes'" class="hud-brackets hud-surface pointer-events-auto mb-2 w-full max-w-xl px-4 py-3">
-          id="dock-panel-routes"
-          role="tabpanel"
-          aria-labelledby="dock-tab-routes"
-          [hidden]="activeTab() !== 'routes'"
-          class="hud-brackets hud-surface pointer-events-auto mb-2 w-full max-w-xl px-4 py-3"
-        >
           <app-routes-panel
             [result]="routeResult()"
             [pending]="routePending()"
@@ -374,39 +215,21 @@ function isWideViewport(): boolean {
               [attr.aria-controls]="activeTab() === tab ? 'dock-panel-' + tab : null"
               (click)="toggleTab(tab)"
               class="type-eyebrow px-3 py-2 transition-colors focus-visible:outline-1 focus-visible:-outline-offset-1 focus-visible:outline-accent sm:px-4"
-              [class]="
+              [class]="activeTab() === tab ? 'bg-accent/15 text-accent' : 'text-muted hover:bg-accent/8 hover:text-accent'"
-                activeTab() === tab
-                  ? 'bg-accent/15 text-accent'
-                  : 'text-muted hover:bg-accent/8 hover:text-accent'
-              "
             >
               {{ tabLabel(tab) }}
             </button>
           }
         </div>
-        <!-- Only while the map is away from the present: at the present the date is
-             today's, which the reader's own machine already says. -->
-        @if (date()) {
-          <p
-            class="ml-auto flex items-baseline gap-2 border-l border-border/40 px-3 py-2 sm:px-4"
-            data-testid="hud-date"
-          >
-            <span class="type-label text-muted">Date</span>
-            <span class="text-sm text-accent tabular-nums">{{ date() }}</span>
-          </p>
-        }
         @if (range()) {
-          <p
+          <p class="ml-auto flex items-baseline gap-2 border-l border-border/40 px-3 py-2 sm:px-4">
-            class="flex items-baseline gap-2 border-l border-border/40 px-3 py-2 sm:px-4"
-            [class.ml-auto]="!date()"
-          >
             <span class="type-label text-muted">Range</span>
             <span class="text-sm text-accent tabular-nums">{{ range() }}</span>
           </p>
         }
       </div>
     </div>
-  `,
+  `
 })
 export class HudDockComponent implements OnInit {
   /** Readout panel contents. An empty title means there is nothing to read out, and no tab for it. */
@@ -418,8 +241,6 @@ export class HudDockComponent implements OnInit {
   readonly note = input('');
   /** Camera range, pre-formatted by the scene, which is the only thing that knows the units. */
   readonly range = input('');
-  /** The date the sky is drawn for; empty while the map is drawn for the present. */
-  readonly date = input('');
   /** Layer state; `null` means the surface has no layers to toggle and no Display tab. */
   readonly display = input<HudDisplay | null>(null);
   /** Which panel is open on a wide viewport when the dock mounts. */
@@ -450,14 +271,12 @@ export class HudDockComponent implements OnInit {
     // Always offered, even with nothing in it: it is the only place that says the map can keep
     // anything at all, and a tab that appears once you already know is a tab that never taught.
     'bookmarks',
-    ...(this.display() ? (['display'] as const) : []),
+    ...(this.display() ? (['display'] as const) : [])
   ]);
 
   readonly activeTab = signal<DockTab | null>(null);
 
   readonly bookmarks = inject(BookmarksStore);
-  readonly time = inject(TimeStore);
-  readonly timeRates = TIME_RATES;
 
   private readonly search = viewChild(SearchComponent);
   private readonly host = inject<ElementRef<HTMLElement>>(ElementRef);
@@ -512,10 +331,7 @@ export class HudDockComponent implements OnInit {
       return;
     }
     const target = event.target as HTMLElement | null;
-    if (
+    if (target && (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA' || target.isContentEditable)) {
-      target &&
-      (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA' || target.isContentEditable)
-    ) {
       return;
     }
     event.preventDefault();
@@ -527,11 +343,7 @@ export class HudDockComponent implements OnInit {
   /** On a narrow viewport the panel is a sheet over the scene: tapping the scene folds it away. */
   @HostListener('document:pointerdown', ['$event'])
   onDocumentPointerDown(event: PointerEvent): void {
-    if (
+    if (this.activeTab() && !isWideViewport() && !this.host.nativeElement.contains(event.target as Node)) {
-      this.activeTab() &&
-      !isWideViewport() &&
-      !this.host.nativeElement.contains(event.target as Node)
-    ) {
       this.activeTab.set(null);
     }
   }

src/app/shared/models/body.model.ts

@@ -29,14 +29,4 @@ export interface BodyRecord {
    * relative to that planet, not heliocentrically. Undefined for planets/dwarfs.
    */
   parentBodyId?: string;
-  /**
-   * How the body turns on its own axis: the sidereal rotation period in hours, negative where
-   * Horizons gives a negative rate (Venus, Uranus), and the tilt of that axis from its orbital
-   * plane — which past 90 degrees already says the turn is retrograde.
-   *
-   * Absent where Horizons publishes neither — the view then leaves the body still rather than
-   * spinning it at an invented rate.
-   */
-  rotationPeriodHours?: number;
-  obliquityDeg?: number;
 }

src/app/shared/rendering/texture-catalog.ts

@@ -4,21 +4,18 @@ import * as THREE from 'three/webgpu';
  * Real NASA/ESA/USGS photography baked into `src/assets/textures/bodies/` at build time,
  * keyed by the same ids used in `bodies.json`.
  *
- * Only surface *maps* belong here: equirectangular images, twice as wide as tall, that wrap a
+ * This map is the whole of what has actually been photographed. Everything else — every
- * sphere. Everything else — every exoplanet, since not one has ever been imaged, and every moon
+ * exoplanet, since not one has ever been imaged, and the moons no probe returned a usable map
- * or dwarf planet with no such map in the repository — falls through to
+ * of — falls through to `procedural-planet-texture.ts`, which derives a surface from the body's
- * `procedural-planet-texture.ts`, which derives a surface from the body's own measured size,
+ * own measured size, mass, orbit and host star instead.
- * mass, orbit and host star instead.
  *
- * Io, Pluto, Titan and Deimos used to be listed with the square photographs of them in
+ * Provenance (all public domain NASA/JPL or CC BY 4.0 Solar System Scope, via Wikimedia
- * `assets/textures/bodies/`: pictures of a lit disc against black sky, not maps. Wrapped round a
+ * Commons — see each file's Commons page for the original credit line):
- * sphere they put black sky on a fifth to a third of the surface, in a band up to 57 degrees wide
+ * mercury/venus/earth/mars/saturn/uranus/neptune/moon/sun/saturn-ring/skybox — Solar System
- * across the equator that the spin then swept past the camera. They are left out until a real map
+ * Scope texture pack (CC BY 4.0); jupiter — Solar System Scope 8k pack (CC BY 4.0); pluto —
- * of each is added.
+ * NASA/JHUAPL/SwRI New Horizons true-color mosaic; deimos — NASA/JPL/University of Arizona
- *
+ * MRO HiRISE; io — NASA/JPL Galileo highest-resolution true-color mosaic; titan — NASA/JPL
- * Provenance (CC BY 4.0 Solar System Scope, via Wikimedia Commons — see each file's Commons page
+ * Cassini true-color view.
- * for the original credit line): mercury/venus/earth/mars/saturn/uranus/neptune/moon/sun/
- * saturn-ring/skybox — Solar System Scope texture pack; jupiter — Solar System Scope 8k pack.
  */
 const BODY_TEXTURE_PATHS: Record<string, string> = {
   mercury: 'assets/textures/bodies/mercury.jpg',
@@ -29,7 +26,11 @@ const BODY_TEXTURE_PATHS: Record<string, string> = {
   saturn: 'assets/textures/bodies/saturn.jpg',
   uranus: 'assets/textures/bodies/uranus.jpg',
   neptune: 'assets/textures/bodies/neptune.jpg',
-  moon: 'assets/textures/bodies/moon.jpg'
+  pluto: 'assets/textures/bodies/pluto.jpg',
+  moon: 'assets/textures/bodies/moon.jpg',
+  deimos: 'assets/textures/bodies/deimos.jpg',
+  io: 'assets/textures/bodies/io.jpg',
+  titan: 'assets/textures/bodies/titan.jpg'
 };
 
 /** The Sun isn't a `BodyRecord` (it's the system's star marker), so it's looked up separately. */

src/app/shared/state/time.store.spec.ts

@@ -1,74 +0,0 @@
-import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
-
-import { TimeStore } from './time.store';
-
-const MS_PER_DAY = 86_400_000;
-const START = new Date('2026-09-22T12:00:00Z');
-
-describe('TimeStore', () => {
-  let time: TimeStore;
-
-  beforeEach(() => {
-    vi.useFakeTimers();
-    vi.setSystemTime(START);
-    time = new TimeStore();
-  });
-
-  afterEach(() => {
-    vi.useRealTimers();
-  });
-
-  it('keeps the world’s own time until asked otherwise', () => {
-    const opened = time.julianDate();
-    vi.advanceTimersByTime(10_000);
-
-    expect(time.julianDate() - opened).toBeCloseTo(10_000 / MS_PER_DAY, 9);
-    expect(time.date().toISOString()).toBe('2026-09-22T12:00:10.000Z');
-  });
-
-  it('runs the sky faster without moving where it starts from', () => {
-    const opened = time.julianDate();
-    time.setRate(3600);
-    vi.advanceTimersByTime(1000);
-
-    // A second of watching is an hour of sky, and the date did not jump when the rate changed.
-    expect(time.julianDate() - opened).toBeCloseTo(1 / 24, 9);
-  });
-
-  it('carries on from where it had got to when the rate changes again', () => {
-    time.setRate(86_400);
-    vi.advanceTimersByTime(2000); // two days of sky
-    const afterTwoDays = time.julianDate();
-
-    time.setRate(1);
-    vi.advanceTimersByTime(1000);
-
-    // Slowing down keeps the two days: it does not rewind to the wall clock.
-    expect(time.julianDate() - afterTwoDays).toBeCloseTo(1000 / MS_PER_DAY, 9);
-    expect(time.julianDate() - afterTwoDays).toBeLessThan(1 / 24);
-  });
-
-  it('knows the map is away from now even once it is back at real time', () => {
-    expect(time.atNow()).toBe(true);
-    time.setRate(2_629_800);
-    vi.advanceTimersByTime(5000);
-    time.setRate(1);
-
-    // Real time, months ahead: the rate says nothing about where the clock stands.
-    expect(time.atNow()).toBe(false);
-    time.reset();
-    expect(time.atNow()).toBe(true);
-  });
-
-  it('comes back to now, at real time', () => {
-    time.setRate(2_629_800);
-    vi.advanceTimersByTime(5000); // months away
-    expect(time.date().getUTCFullYear()).toBeGreaterThan(START.getUTCFullYear());
-
-    time.reset();
-
-    expect(time.rate()).toBe(1);
-    // Now, not the moment the store was built: five seconds of wall clock have passed.
-    expect(time.date().toISOString()).toBe(new Date(START.getTime() + 5000).toISOString());
-  });
-});

src/app/shared/state/time.store.ts

@@ -1,82 +0,0 @@
-import { Injectable, signal } from '@angular/core';
-
-import { dateToJulianDate } from '../astro/constants';
-
-/**
- * How fast the map's clock runs, in seconds of sky per second of wall clock.
- *
- * The map is built on propagated orbits and published rotation periods, both of which are
- * functions of a date — so the only thing standing between it and a working orrery is the number
- * on this list. At real time nothing appears to move: Earth turns 15 degrees an hour and takes a
- * year to go round, and a reader watching for a minute sees a still picture.
- *
- * An hour a second is the rate at which rotation reads — Jupiter turns once every ten seconds of
- * watching. A day a second is the rate at which the inner planets read. A month a second carries
- * the outer ones, at which point the inner four are a blur, which is honest: that is what the
- * solar system does.
- */
-export const TIME_RATES = [
-  { label: 'Real time', secondsPerSecond: 1 },
-  { label: '1 h/s', secondsPerSecond: 3600 },
-  { label: '1 d/s', secondsPerSecond: 86_400 },
-  { label: '1 mo/s', secondsPerSecond: 2_629_800 },
-] as const;
-
-const MS_PER_DAY = 86_400_000;
-const JULIAN_DATE_AT_EPOCH = 2440587.5;
-
-/**
- * The date the map is drawn for.
- *
- * Read every frame rather than held in a signal: it changes continuously, and a signal that
- * changed sixty times a second would ask the whole HUD to re-render for a number nothing is
- * watching. The rate *is* a signal, since a reader sets it and the controls read it back.
- *
- * Changing the rate re-anchors instead of rewinding: the date carries on from where it had got
- * to, so speeding up and slowing down never jumps the sky.
- */
-@Injectable({ providedIn: 'root' })
-export class TimeStore {
-  readonly rate = signal<number>(TIME_RATES[0].secondsPerSecond);
-  /**
-   * Whether the map is drawn for the present. Not the same as a rate of one: after an excursion at
-   * a month a second, real time carries on from months ahead, and the map is still away from now.
-   */
-  readonly atNow = signal(true);
-
-  private anchorJd = dateToJulianDate();
-  private anchorWallMs = Date.now();
-
-  /** Julian date for this instant, at the rate the reader chose. */
-  julianDate(): number {
-    return this.anchorJd + ((Date.now() - this.anchorWallMs) * this.rate()) / MS_PER_DAY;
-  }
-
-  /**
-   * The same instant as a date, for anything that prints it.
-   *
-   * Rounded to the millisecond, which is all a `Date` holds: a Julian date near 2 461 000 has
-   * about a twentieth of a millisecond of resolution left in a double, and `new Date` truncates
-   * what is left rather than rounding it, so ten seconds came back as 9.999.
-   */
-  date(): Date {
-    return new Date(Math.round((this.julianDate() - JULIAN_DATE_AT_EPOCH) * MS_PER_DAY));
-  }
-
-  setRate(secondsPerSecond: number): void {
-    this.anchorJd = this.julianDate();
-    this.anchorWallMs = Date.now();
-    this.rate.set(secondsPerSecond);
-    if (secondsPerSecond !== 1) {
-      this.atNow.set(false);
-    }
-  }
-
-  /** Back to now, at real time — the state the map opens in. */
-  reset(): void {
-    this.anchorJd = dateToJulianDate();
-    this.anchorWallMs = Date.now();
-    this.rate.set(TIME_RATES[0].secondsPerSecond);
-    this.atNow.set(true);
-  }
-}

src/assets/data/bodies.json

@@ -13,9 +13,7 @@
       "argumentOfPeriapsisDeg": 29.19561108948743,
       "meanAnomalyAtEpochDeg": 103.9465145977117,
       "epochJd": 2460676.5
-    },
+    }
-    "rotationPeriodHours": 1407.512239412851,
-    "obliquityDeg": 2.11
   },
   {
     "id": "venus",
@@ -31,9 +29,7 @@
       "argumentOfPeriapsisDeg": 55.15075425343929,
       "meanAnomalyAtEpochDeg": 280.0749102629981,
       "epochJd": 2460676.5
-    },
+    }
-    "rotationPeriodHours": -5832.539941165383,
-    "obliquityDeg": 177.3
   },
   {
     "id": "earth",
@@ -49,9 +45,7 @@
       "argumentOfPeriapsisDeg": 272.9783142442708,
       "meanAnomalyAtEpochDeg": 357.4122246804211,
       "epochJd": 2460676.5
-    },
+    }
-    "rotationPeriodHours": 23.934472399219285,
-    "obliquityDeg": 23.4392911
   },
   {
     "id": "mars",
@@ -67,9 +61,7 @@
       "argumentOfPeriapsisDeg": 286.7114828288203,
       "meanAnomalyAtEpochDeg": 124.444888195349,
       "epochJd": 2460676.5
-    },
+    }
-    "rotationPeriodHours": 24.622955438662025,
-    "obliquityDeg": 25.19
   },
   {
     "id": "jupiter",
@@ -85,9 +77,7 @@
       "argumentOfPeriapsisDeg": 273.6090683600047,
       "meanAnomalyAtEpochDeg": 58.98282567286461,
       "epochJd": 2460676.5
-    },
+    }
-    "rotationPeriodHours": 9.925102371306965,
-    "obliquityDeg": 3.13
   },
   {
     "id": "saturn",
@@ -103,9 +93,7 @@
       "argumentOfPeriapsisDeg": 337.1663598259115,
       "meanAnomalyAtEpochDeg": 264.9877650588944,
       "epochJd": 2460676.5
-    },
+    }
-    "rotationPeriodHours": 10.656221583138441,
-    "obliquityDeg": 26.73
   },
   {
     "id": "uranus",
@@ -121,9 +109,7 @@
       "argumentOfPeriapsisDeg": 90.49593456147204,
       "meanAnomalyAtEpochDeg": 255.8822481742851,
       "epochJd": 2460676.5
-    },
+    }
-    "rotationPeriodHours": -17.24003330792427,
-    "obliquityDeg": 97.77
   },
   {
     "id": "neptune",
@@ -139,9 +125,7 @@
       "argumentOfPeriapsisDeg": 268.1146665565159,
       "meanAnomalyAtEpochDeg": 319.6858384317641,
       "epochJd": 2460676.5
-    },
+    }
-    "rotationPeriodHours": 16.110037586020876,
-    "obliquityDeg": 28.32
   },
   {
     "id": "pluto",
@@ -157,9 +141,7 @@
       "argumentOfPeriapsisDeg": 113.5754868232679,
       "meanAnomalyAtEpochDeg": 51.93655343727463,
       "epochJd": 2460676.5
-    },
+    }
-    "rotationPeriodHours": 153.29335198,
-    "obliquityDeg": 119.6
   },
   {
     "id": "moon",
@@ -176,9 +158,7 @@
       "meanAnomalyAtEpochDeg": 290.7825171697369,
       "epochJd": 2460676.5
     },
-    "parentBodyId": "earth",
+    "parentBodyId": "earth"
-    "rotationPeriodHours": 664.8546956215548,
-    "obliquityDeg": 6.67
   },
   {
     "id": "phobos",
@@ -195,8 +175,7 @@
       "meanAnomalyAtEpochDeg": 342.6005509941174,
       "epochJd": 2460676.5
     },
-    "parentBodyId": "mars",
+    "parentBodyId": "mars"
-    "rotationPeriodHours": 7.660212212136228
   },
   {
     "id": "deimos",
@@ -213,8 +192,7 @@
       "meanAnomalyAtEpochDeg": 273.8943716897566,
       "epochJd": 2460676.5
     },
-    "parentBodyId": "mars",
+    "parentBodyId": "mars"
-    "rotationPeriodHours": 30.304279685850094
   },
   {
     "id": "io",
@@ -231,8 +209,7 @@
       "meanAnomalyAtEpochDeg": 74.88524962049125,
       "epochJd": 2460676.5
     },
-    "parentBodyId": "jupiter",
+    "parentBodyId": "jupiter"
-    "rotationPeriodHours": 42.51537583211252
   },
   {
     "id": "europa",
@@ -249,8 +226,7 @@
       "meanAnomalyAtEpochDeg": 40.72575250295771,
       "epochJd": 2460676.5
     },
-    "parentBodyId": "jupiter",
+    "parentBodyId": "jupiter"
-    "rotationPeriodHours": 85.27848729079142
   },
   {
     "id": "ganymede",
@@ -267,8 +243,7 @@
       "meanAnomalyAtEpochDeg": 355.7249344187845,
       "epochJd": 2460676.5
     },
-    "parentBodyId": "jupiter",
+    "parentBodyId": "jupiter"
-    "rotationPeriodHours": 171.78271980469088
   },
   {
     "id": "callisto",
@@ -285,8 +260,7 @@
       "meanAnomalyAtEpochDeg": 126.0198540648681,
       "epochJd": 2460676.5
     },
-    "parentBodyId": "jupiter",
+    "parentBodyId": "jupiter"
-    "rotationPeriodHours": 400.52470451330635
   },
   {
     "id": "titan",
@@ -303,8 +277,7 @@
       "meanAnomalyAtEpochDeg": 32.18862839469676,
       "epochJd": 2460676.5
     },
-    "parentBodyId": "saturn",
+    "parentBodyId": "saturn"
-    "rotationPeriodHours": 382.87527117206236
   },
   {
     "id": "triton",
@@ -321,7 +294,6 @@
       "meanAnomalyAtEpochDeg": 273.1157438944629,
       "epochJd": 2460676.5
     },
-    "parentBodyId": "neptune",
+    "parentBodyId": "neptune"
-    "rotationPeriodHours": 141.05626027628523
   }
 ]

tools/etl/fetchSolarSystem.ts

@@ -1,14 +1,10 @@
 import { writeFileSync } from 'node:fs';
 
 import { BodyRecord } from '../../src/app/shared/models/body.model';
-import { gmForParent } from '../../src/app/shared/astro/constants';
-import { orbitalPeriodDays } from '../../src/app/shared/astro/kepler';
 import { SUN_STAR_ID } from '../../src/app/shared/models/star.model';
 import { fetchHorizonsBody } from './lib/horizons';
 import { dataPath, ensureDataDir } from './lib/paths';
 
-const HOURS_PER_DAY = 24;
-
 interface BodySpec {
   id: string;
   name: string;
@@ -16,11 +12,6 @@ interface BodySpec {
   horizonsCommand: string;
   center: string;
   parentBodyId?: string;
-  /**
-   * Obliquity to orbit, in degrees, where the Horizons page states none. Pluto's is from the IAU
-   * WGCCRE 2015 pole (RA 132.99, Dec -6.16), 119.6 degrees: past 90, so it turns retrograde.
-   */
-  obliquityDeg?: number;
 }
 
 // Sun-centered planets/dwarf, then their major moons (planetocentric elements).
@@ -33,7 +24,7 @@ const BODY_SPECS: BodySpec[] = [
   { id: 'saturn', name: 'Saturn', kind: 'planet', horizonsCommand: '699', center: '500@10' },
   { id: 'uranus', name: 'Uranus', kind: 'planet', horizonsCommand: '799', center: '500@10' },
   { id: 'neptune', name: 'Neptune', kind: 'planet', horizonsCommand: '899', center: '500@10' },
-  { id: 'pluto', name: 'Pluto', kind: 'dwarf', horizonsCommand: '999', center: '500@10', obliquityDeg: 119.6 },
+  { id: 'pluto', name: 'Pluto', kind: 'dwarf', horizonsCommand: '999', center: '500@10' },
   { id: 'moon', name: 'Moon', kind: 'moon', horizonsCommand: '301', center: '500@399', parentBodyId: 'earth' },
   { id: 'phobos', name: 'Phobos', kind: 'moon', horizonsCommand: '401', center: '500@499', parentBodyId: 'mars' },
   { id: 'deimos', name: 'Deimos', kind: 'moon', horizonsCommand: '402', center: '500@499', parentBodyId: 'mars' },
@@ -65,18 +56,6 @@ export async function fetchSolarSystem(): Promise<BodyRecord[]> {
       console.warn(`  no physical radius found for ${spec.name}; defaulting to 0.`);
     }
 
-    // Every moon listed here is tidally locked, so its day is its orbit — as drawn, from these
-    // elements and the parent's mass by Kepler. Not every page says so: the Moon's gives a rate,
-    // the true sidereal month, 1.4% off the orbit these elements trace, so its face drifted five
-    // degrees an orbit; Titan's gives nothing, so it did not turn. Taking the orbit keeps one face
-    // towards the parent, which is what synchronous means.
-    const rotationPeriodHours = result.tidallyLocked || spec.kind === 'moon'
-      ? orbitalPeriodDays(result.orbit.semiMajorAxisAu, gmForParent(spec.parentBodyId)) * HOURS_PER_DAY
-      : result.rotationPeriodHours;
-    if (rotationPeriodHours === undefined) {
-      console.warn(`  no rotation period found for ${spec.name}; it will not turn.`);
-    }
-
     bodies.push({
       id: spec.id,
       systemStarId: SUN_STAR_ID,
@@ -84,9 +63,7 @@ export async function fetchSolarSystem(): Promise<BodyRecord[]> {
       kind: spec.kind,
       radiusKm: result.radiusKm ?? 0,
       orbit: result.orbit,
-      ...(spec.parentBodyId ? { parentBodyId: spec.parentBodyId } : {}),
+      ...(spec.parentBodyId ? { parentBodyId: spec.parentBodyId } : {})
-      ...(rotationPeriodHours !== undefined ? { rotationPeriodHours } : {}),
-      ...((result.obliquityDeg ?? spec.obliquityDeg) !== undefined ? { obliquityDeg: result.obliquityDeg ?? spec.obliquityDeg } : {})
     });
   }
 

tools/etl/lib/horizons.ts

@@ -20,16 +20,6 @@ export interface HorizonsQuery {
 export interface HorizonsResult {
   radiusKm?: number;
   orbit: OrbitalElements;
-  /**
-   * Sidereal rotation period in hours, negative where the page gives a negative rate —
-   * Venus and Uranus. Absent where the page publishes none. The same pages also give an obliquity
-   * past 90 degrees for those two, which says the same thing again; see the renderer's spinFor.
-   */
-  rotationPeriodHours?: number;
-  /** Tilt of the rotation axis from the body's own orbital plane, in degrees. */
-  obliquityDeg?: number;
-  /** The page says "Synchronous" instead of a period: its day is its orbit. */
-  tidallyLocked: boolean;
 }
 
 const RADIUS_PATTERNS = [
@@ -40,66 +30,10 @@ const RADIUS_PATTERNS = [
   /Radius\s*\(gravity\),?\s*km\s*=\s*([\d.]+)/i
 ];
 
-/**
- * How each page states how fast the body turns, in the order they are tried.
- *
- * The rate in radians per second is preferred wherever it appears: it is unambiguous and it is
- * signed: Venus and Uranus carry a negative one. A period in hours or days
- * comes next, then the sexagesimal form the giant planets use, and finally the word most moons carry
- * instead of a number, Synchronous. Not all do — the Moon's page gives a rate, Titan's nothing —
- * so the caller treats every moon it lists as locked whatever its page says.
- */
-const ROTATION_RATE_PATTERN = /Rot(?:ational)?\.?\s*Rate\s*[(,]\s*rad\/s\s*\)?\s*=\s*(-?[\d.]+)/i;
-const ROTATION_PERIOD_PATTERNS = [
-  /Sid(?:ereal|\.)?\s*rot\.?\s*period[^=]*=\s*(-?[\d.]+)(?:\+-[\d.]+)?\s*(h|hr|hrs|d|day|days)\b/i,
-  /Rotation(?:al)?\s*period[^=]*=\s*(-?[\d.]+)\s*(h|hr|hrs|d|day|days)\b/i
-];
-/** `9h 55m 29.711 s`, as Jupiter and Saturn state it. */
-const SEXAGESIMAL_ROTATION_PATTERN = /Sid(?:ereal|\.)?\s*rot\.?\s*period[^=]*=\s*(\d+)\s*h\s*(\d+)\s*m\s*([\d.]+)\s*s/i;
-const SYNCHRONOUS_PATTERN = /Rotation(?:al)?\s*period\s*=?\s*:?\s*Synchronous/i;
-const OBLIQUITY_PATTERN = /Obliquity\s*to\s*orbit[^=]*=\s*(-?[\d.]+)/i;
-
-const HOURS_PER_DAY = 24;
-const SECONDS_PER_HOUR = 3600;
-
-/**
- * True where the page gives no number because the body keeps one face to its parent, so its day
- * is its orbit. The period itself is then Kepler's, which the caller
- * works out from the elements above and the parent's mass.
- */
-export function isTidallyLocked(text: string): boolean {
-  return SYNCHRONOUS_PATTERN.test(text);
-}
-
-/** Sidereal rotation period, in hours, from whichever form the page states it in. */
-export function extractRotationPeriodHours(text: string): number | undefined {
-  const rate = text.match(ROTATION_RATE_PATTERN);
-  if (rate && Number(rate[1]) !== 0) {
-    return (2 * Math.PI) / (Number(rate[1]) * SECONDS_PER_HOUR);
-  }
-  const sexagesimal = text.match(SEXAGESIMAL_ROTATION_PATTERN);
-  if (sexagesimal) {
-    return Number(sexagesimal[1]) + Number(sexagesimal[2]) / 60 + Number(sexagesimal[3]) / SECONDS_PER_HOUR;
-  }
-  for (const pattern of ROTATION_PERIOD_PATTERNS) {
-    const match = text.match(pattern);
-    if (match) {
-      const hours = Number(match[1]) * (match[2].toLowerCase().startsWith('d') ? HOURS_PER_DAY : 1);
-      return Number.isFinite(hours) && hours !== 0 ? hours : undefined;
-    }
-  }
-  return undefined;
-}
-
-export function extractObliquityDeg(text: string): number | undefined {
-  const match = text.match(OBLIQUITY_PATTERN);
-  return match ? Number(match[1]) : undefined;
-}
-
 /**
  * Queries JPL Horizons for a body's heliocentric (or planetocentric, for moons) osculating
- * orbital elements plus, when available, its mean physical radius and how it turns — all in a
+ * orbital elements plus, when available, its mean physical radius — both in a single
- * single request (`OBJ_DATA=YES` + `EPHEM_TYPE=ELEMENTS`).
+ * request (`OBJ_DATA=YES` + `EPHEM_TYPE=ELEMENTS`).
  */
 export async function fetchHorizonsBody(query: HorizonsQuery): Promise<HorizonsResult> {
   const url =
@@ -110,10 +44,7 @@ export async function fetchHorizonsBody(query: HorizonsQuery): Promise<HorizonsR
   const text = await fetchTextCached(url, query.cacheKey);
   return {
     radiusKm: extractRadiusKm(text),
-    orbit: extractOrbitalElements(text),
+    orbit: extractOrbitalElements(text)
-    rotationPeriodHours: extractRotationPeriodHours(text),
-    obliquityDeg: extractObliquityDeg(text),
-    tidallyLocked: isTidallyLocked(text)
   };
 }