Task 579: Fix 3D Orbital Insertion — Planet Initial Angles at Common Epoch

Status: DONE

Description

Human directive phase 32: "3D 可視化において、周回軌道などの正しい目的地に投入される計算になっていない？TDD で修正"

Root cause: Each planet's initialAngle is set from its own event JD (departure/arrival),

not from a common mission-start epoch. This means at day 0, planets are at wrong positions

(Earth is off by ~122°). The orbital animation clock propagates from these wrong initial

positions, so arrival alignment is broken.

Fix: Compute all planet ecliptic longitudes at the mission start JD (Mars departure),

then let meanMotionPerDay propagation naturally bring each planet to the correct position

at its departure/arrival day.

Plan (TDD)

1. Write test: at each transfer's arrival day, planetPositionAtTime(toOrbit, arrDay)

should place the planet at the correct ecliptic longitude (from 3d_orbital_analysis.json)

1. Write test: at day 0, all planets should be at their mission-start positions
2. Fix prepareFullRouteScene() to compute initialAngle from mission-start JD
3. Update orbital-3d-analysis.ts to also output planet longitudes at mission start
4. Regenerate 3d_orbital_analysis.json

Files

• ts/src/orbital-3d-analysis.ts — add mission-start longitudes
• ts/src/orbital-3d-analysis.test.ts — test data presence
• ts/src/orbital-3d-viewer-data.ts — fix initialAngle computation
• ts/src/orbital-3d-viewer-data.test.ts — TDD arrival alignment tests
• reports/data/calculations/3d_orbital_analysis.json — regenerate