moon_position_eci
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Defined in: ephemeris.rs:28
fn moon_position_eci(epoch: &[Epoch<Tdb>](../../structs/epoch/)) -> [Vec3<frame::Gcrs>](../../structs/vec3/)
Moon position vector in ECI (J2000) frame [km].
Uses the analytical model from Meeus “Astronomical Algorithms” Chapter 47 with full periodic term tables (60 terms for longitude/distance, 60 for latitude), E correction factor, and planetary perturbation corrections.
Accuracy: ~10” in ecliptic longitude, ~1% in distance (~4,000 km).
Time scale
Section titled “Time scale”Meeus ephemerides take a dynamical time argument (TDB), so this signature
requires &Epoch<Tdb> — the caller converts at the boundary
(utc.to_tdb()). (The MoonEphemeris trait, which also abstracts a
UTC-indexed Horizons table, deliberately keeps a &Epoch<Utc> interface;
see MeeusMoonEphemeris.)