This module is for calculating ephemeris for planetary bodies using the [JPL Development Ephemerides](https://ssd.jpl.nasa.gov/planets/eph_export.html) data. More information including API documentation is [here](./docs/README.md).
Toolkit for solar system ephemerides and satellite propagation via SGP4
NASA JPL Horizons — solar-system body ephemerides
A **functional**, high-precision astrological calculation library powered by Swiss Ephemeris. This library provides pure functions for calculating charts, analyzing relationships, and generating ephemerides.
Sidereal-Ephemeris is a JavaScript library designed to handle ephemerides from the [JPL Solar System Dynamics Group](https://ssd.jpl.nasa.gov/).
High-accuracy lunar crescent visibility and moon sighting calculations using JPL DE442S ephemerides. Implements Yallop and Odeh criteria for Islamic crescent sighting workflows.
CSL style for Ephemerides Theologicae Lovanienses
Calculator/parser for JPL ephemeris data
Test carta-backend in npm
High-performance SGP4 GPU/WebGPU/WebGL WASM wrapper.
High-precision solar system ephemeris engine. Zero dependencies, Browser & Node.js.
Sidereal is a JavaScript library designed for astronomical calculations.
Astrology Chart
Command-line interface for querying astronomical databases via astroquery
MCP server for astronomical database queries via direct HTTP/TAP APIs
Node module to generate planetary ephemeris data for a given date and location. This module repurposes code created by Ole Nielsen in 2002 and Peter Hayes in 1999.
JavaScript client wrapper for the HORIZONS database
Command-line interface for querying astronomical databases via astroquery
Interactive TUI for querying astronomical databases via astrocli
Precision astronomy & satellite mechanics in safe, fast Rust.
Library for computing the azimuth and elevation of objects in space. Includes the Sun, Moon, Mars, Jupiter, Saturn. Also, human-made satellites can be located via TLE files.
Satellite Toolkit
Orbit determination toolkit in Rust. Provides astrometric parsing, observer management, and initial orbit determination (Gauss method) with JPL ephemeris support.
Coordinate frames, reference transforms, epochs, and celestial body ephemerides for orbital mechanics.
Domain layer for ASSIST + REBOUND solar-system propagation: orbits, ephemerides, observatories, STM, batch + parallel
Astronomical ephemeris calculations
A lightweight library to perform basic astronomical calculations, inspired by Python's Astropy syntax.
Fast participating-media and optics foundation: typed rays, optical coefficients, phase functions, spectra, and optical-depth integration.
Typed Newtonian numerical dynamics: state propagation, acceleration models, RK4/DOPRI5/DOP853 integrators, variational equations, STM, covariance, and gravity-field kernels.
High-precision astronomy and satellite mechanics in Rust.
Bevy ECS adapter for the astrodyn orbital-dynamics gateway
Jyotish — astronomical computation engine for planetary positions, calendar systems, and celestial event prediction
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