From 89c2568018c162d4e7b46be7d57406dfa69bafdc Mon Sep 17 00:00:00 2001 From: Senrokai Date: Wed, 30 Sep 2026 13:34:38 +0200 Subject: [PATCH] Describe the star at a system's centre as it is drawn now, not by the innermost-orbit rule and its halo MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The README still said the star was sized against its innermost orbit and made visible by a halo, two things 7213f98 and 2242fe0 removed. It now says what the view draws: the star at its own radius on the orbits' scale, the archive's for a host and derived from luminosity and temperature otherwise, marked "from colour and brightness" on the card; a limb-darkened disc in its blackbody's colour, lighting its planets in that colour against the Sun's; a grey point where nothing gives a size or temperature (5aac46d); the three-pixel floor and no halo; the camera held at 0.05 AU or three radii, whichever is further, and a giant framed inside its neighbours' ring (d1aa22e). Measured on :4302 at 1600 by 1000 against published radii: Sun 1.0000 R☉ (card "1.00 solar radii"); Proxima Centauri 0.1410, the archive's st_rad (0.154 in Boyajian et al. 2012); Sirius A 1.7943, derived, card "~1.8 solar radii, from colour and brightness" (1.711); TRAPPIST-1 0.1192 (0.119). The star's light: Sun (1, 1, 1), Proxima (1, 0.523, 0.165), TRAPPIST-1 (1, 0.443, 0.095), ups And (F8V) (0.899, 0.937, 1), Sirius (0.52, 0.666, 1), intensity pi in every one. Co-Authored-By: Claude Opus 5.5 (1M context) --- README.md | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/README.md b/README.md index 705debe..14ede09 100644 --- a/README.md +++ b/README.md @@ -62,15 +62,16 @@ instead of having to be inferred from a shape in space. The camera frames that g the orbits, from the field of view it actually has, so the outermost ring sits inside the frame with room around it at any system scale and any window shape. -The star at the centre is sized against the system's *innermost* orbit, so it can never swallow -its closest planet, while the camera is placed to frame the *outermost* ring — and in the solar -system those differ by a factor of a hundred. At the distance that fits Pluto in view, a disc -that stays clear of Mercury is about a pixel across, and no radius satisfies both. So the disc -stays honest to the orbits and the star's halo carries its visibility, floored against the framed -radius: light is not a surface, and a glow reaching past the innermost orbit says the star is -bright rather than that it is large. That floor is bounded from both sides — large enough that -the star reads at a glance, small enough that Venus's and Earth's orbits stay legible as rings -around it. Mercury's, three pixels wide at that range, does not survive either way. +The star at the centre is drawn at its own radius, to the same scale as its orbits: the +archive's measured radius for a planet host, and otherwise one derived from its luminosity and +temperature (Stefan-Boltzmann), which the card marks "from colour and brightness". Its surface +is a limb-darkened disc in the colour of a blackbody at its temperature, and its planets are lit +in that colour, relative to the Sun's, so the solar system's photographs stay as they were +taken. A star nothing gives a size or a temperature for is a grey point. Like every marker, the +disc is never drawn smaller than three pixels, so a red dwarf framed with its outermost orbit +still shows; there is no halo. The camera comes no closer to its centre than 0.05 AU or three of +its radii, whichever is further, and a giant is framed far enough back that its disc stays +inside the ring its neighbours' names are drawn on. ![51 Pegasi b: a surface derived from its measured mass, orbit and host-star luminosity, beside the figures it was derived from](docs/screenshots/body-detail.jpg)