timotejroiko/sweph

Astrological charting for JavaScript and TypeScript: natal, transit, synastry, composite and Davison charts from the Swiss Ephemeris via the Morphemeris API. ESM-only, runs in Node and the browser, bring your own API key.

Pure-Rust astronomical ephemeris for astrology — Vedic, Western, Chinese, and 9 world traditions

JavaScript Library for Astronomical Calculations

Swiss Ephemeris source code, official release by Astrodienst. For reporting issues or problems, please use the public mailing list https://groups.io/g/swisseph

Python library for Traditional Astrology

Quickly produce both human-readable and JSON-formatted astrology chart data based on the Swiss Ephemeris and astro.com.

Astro: Go Astronomy Algorithms Library - Chinese Lunar Calendar, Solar/Lunar Eclipses, Sun/Moon/Planet Positions, Rise/Set, Planet Events, Stars, Coordinates, Orbits, Sundials and Lightweight Ephemerides (天文算法 Go 库：农历、日月食、日月行星位置、升落、行星天象、恒星、坐标、轨道、日晷与轻量星历)

Basic astronomical functions

Astronomy Engine: multi-language calculation of Sun, Moon, and planet positions. Predicts lunar phases, eclipses, transits, oppositions, conjunctions, equinoxes, solstices, rise/set times, and other events. Provides vector and angular coordinate transforms among equatorial, ecliptic, horizontal, and galactic orientations.