Clean-room DE binary reader (~400 lines C) with Chebyshev/Clenshaw
evaluation — no GPL dependency on jpl_eph. Per-backend lazy
initialization preserves PARALLEL SAFE. Existing VSOP87/ELP82B
functions stay IMMUTABLE; new _de() variants are STABLE with
automatic fallback to compiled-in ephemerides on any DE failure.
Implementation:
- de_reader.c: header parse, record seek, Clenshaw recurrence
- eph_provider.c: GUC (pg_orbit.ephemeris_path), lazy init,
ICRS-to-ecliptic frame rotation, on_proc_exit cleanup
- de_funcs.c: 11 new SQL functions (_de variants + diagnostics)
- Constant chain of custody rules 6-8 (frame rotation,
same-provider, AU consistency)
Extract observe_from_geocentric() to astro_math.h for shared use
by planet_funcs.c, moon_funcs.c, and de_funcs.c.
57 → 68 functions, 11 → 12 regression test suites, all passing.
Add observation functions for 19 planetary moons across four systems:
- Galilean moons (Io, Europa, Ganymede, Callisto) via clean-room L1.2 theory
- Saturn moons (Mimas through Hyperion) via TASS 1.7
- Uranus moons (Miranda through Oberon) via GUST86
- Mars moons (Phobos, Deimos) via MarsSat
Add Jupiter decametric radio burst prediction for Radio JOVE operators:
- io_phase_angle() — Io orbital phase from superior conjunction
- jupiter_cml() — System III Central Meridian Longitude with light-time correction
- jupiter_burst_probability() — Carr et al. (1983) source regions A, B, C, D
L1.2 Galilean theory is a clean-room MIT implementation from the published
IMCCE FORTRAN coefficients. All other ephemeris libraries are MIT-licensed
extractions from Stellarium with static caching removed for PARALLEL SAFE.
All 10 regression tests pass. Extension .so grows from 2.4MB to 2.5MB.
