Stage 1. ephem.js: JPL SSD approximate elements (Table 1 + 2a/2b plumbing),
Newton Kepler solver, reusable eclFromElements core (planets + small bodies),
orbitPath sampler. planets.js: 8 planets + Pluto as textured exaggerated spheres
on MEGA-compressed orbits with labels, rebuild-on-drift. verify.html: 9 gates all
green IN BROWSER incl. live Horizons via proxy — Mars @2026-07-15 Δ3.3e-4 AU,
Jupiter Δ2.9e-3, Earth Δ3.9e-5; Mars @J2000 vs live Δ4.8e-5; Jupiter @1900 Δ2.0e-3.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Stage 0. Zero-dependency serve.py (static + allowlisted horizons/sbdb/cad proxy,
sha256 disk cache with past-span immutability). Three.js via pinned importmap,
logarithmic depth, procedural starfield sky (+ Milky Way panorama swap-in), Sun
with additive glow, OrbitControls, brass-and-void HUD, scrubbable time bar,
central bodyWorld position pass, focus/camera system, hash state. Boots clean,
no console errors.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
