celerity is a lightweight, zero-dependency, research-grade native Python astronomy library for precise astronomical calculations and observation planning, with IAU 2006/2000A precession, nutation and aberration models tested for milliarcsecond-level conformance against ERFA.
TerraFrame is a library designed to provided key Earth related calculations and associated functionality to modeling & simulation software. Primarily, TerraFrame provides Earth orientation and gravity routines.
Frozen calibration artifact for the DesiUtils browser ephemeris: harnesses, raw JPL Horizons inputs and regenerated outputs behind a time-scale defect and a nutation-convention defect. Reproducible with npm ci && npm run verify.
Rigid-body dynamics of a spinning gyroscope: steady precession under gravity, nutation, and torque-free tumbling.
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