Task 522: 3D Orbital Analysis Reproduction Tests

Status: DONE

Summary

Add reproduction tests pinning key numerical values from 3d_orbital_analysis.json. This file contains ecliptic z-heights, plane change fractions, Saturn ring approach geometry, and Uranus approach angles — all computed from ephemeris data.

Tests to Add

Transfer plane change fractions (2 tests)

• Max plane change: EP03 Saturn→Uranus = 1.51% (largest out-of-plane)
• All 4 transfers have plane change < 2% (validates coplanar approximation assessment)

Planetary z-heights at epoch (2 tests)

• Saturn z-height 47,708,410 km (0.319 AU) — highest
• Earth z-height -30,511 km (essentially zero)

Saturn ring approach (1 test)

• Approach angle 9.33° (shallow, nearly ring-plane-parallel)
• Enceladus outside rings = true

Uranus approach (1 test)

• Obliquity 97.77°, approach angle 25.33° (equatorial, not polar)

Impact

Pins 3D orbital geometry values. Catches ephemeris or coordinate transform changes that would alter ring crossing or approach geometry analysis.