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Turn the Sun about its IAU pole, once in 25.38 days, as every planet already is

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Every body with IAU elements was turned by its pole and W, but the Sun, which is the system's star
marker and no BodyRecord, was built with an identity rotation and never touched: its pole pointed
at RA 90, Dec 0, 115.03 degrees from the WGCCRE 2015 solar pole (RA 286.13, Dec 63.87), and it
stood still where its W turns 14.1844 degrees a day.

SUN_ROTATIONAL_ELEMENTS carries NAIF body 10 from pck00011.tpc, and the ETL fails if they are not
the kernel's. The scene turns the star marker by bodyOrientation each tick when the star is the
Sun, as the renderer turns the planets. In the running app the Sun's drawn pole lies on the IAU's
(0.00 degrees) and its map turns 14.1844 degrees between 2026-01-01 and 01-02. The map's longitudes
are Solar System Scope's, not Carrington's, so the phase of W is not the Sun's own; the pole and
the rate are.

Controls: leaving the marker unturned fails "turns the Sun about its IAU pole, once in 25.38 days";
the app's elements off the kernel's (W rate 14.18) fails the ETL.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Senrokai
2026-09-29 19:21:15 +02:00
co-authored by Claude Opus 5.5
parent 8e3a494fe9
commit 97b8dd9dc8
4 changed files with 46 additions and 2 deletions
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tools/etl/fetchSolarSystem.ts
+5 -1
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@@ -5,7 +5,7 @@ import { SUN_STAR_ID } from '../../src/app/shared/models/star.model';
import { fetchHorizonsBody } from './lib/horizons';
import { MeanOrbit, parsePlanetMeanElements, parseSatelliteMeanElements, parseSmallBodyElements } from '../../src/app/shared/astro/mean-elements';
import { fetchPlanetMeanElementsText, fetchSatelliteMeanElementsHtml, fetchSmallBodyAnswer } from './lib/mean-elements';
import { MIN_PERIODIC_TERM_DEG, orbitalTermsOfPrimeMeridian, parsePckRotationalElements } from '../../src/app/shared/astro/rotational-elements';
import { MIN_PERIODIC_TERM_DEG, orbitalTermsOfPrimeMeridian, parsePckRotationalElements, SUN_ROTATIONAL_ELEMENTS } from '../../src/app/shared/astro/rotational-elements';
import { fetchPckText } from './lib/pck';
import { dataPath, ensureDataDir } from './lib/paths';
@@ -155,6 +155,10 @@ export async function fetchSolarSystem(): Promise<{ bodies: BodyRecord[]; horizo
const planetElements = await fetchPlanetMeanElementsText();
const satelliteElements = await fetchSatelliteMeanElementsHtml();
const pck = await fetchPckText();
// The app turns the Sun by elements it carries itself; they must be the kernel's.
if (JSON.stringify(parsePckRotationalElements(pck, 10)?.elements) !== JSON.stringify(SUN_ROTATIONAL_ELEMENTS)) {
throw new Error(`The Sun's rotational elements in the app, ${JSON.stringify(SUN_ROTATIONAL_ELEMENTS)}, are not the kernel's.`);
}
const gmById = new Map<string, number | undefined>();
for (const spec of BODY_SPECS) {