msts

Geocentric lunar ephemeris library for OCaml.

Computes the Moon's ecliptic position and phase from a Unix timestamp.

No dependencies beyond the OCaml standard library.

Valid over 1900–2100, validated against JPL Horizons (DE441).

Requirements

• OCaml ≥ 4.14
• dune ≥ 3.17

Install

opam install msts

Use

let e = Msts.compute (Unix.gettimeofday ()) in
Printf.printf "%s %.1f%% %.0f km\n"
 (Msts.phase_name_to_string e.Msts.phase.Msts.name)
 (e.Msts.phase.Msts.illuminated_fraction *. 100.0)
 e.Msts.position.Msts.distance_km

Add to your dune file:

(libraries msts)

See man 3 msts for the full API reference.

License

ISC