Data-Driven Astrology 💫 Kerykeion is a Python library for astrology. It generates SVG charts and extracts detailed structured data for birth charts, synastry, transits, composite charts, and more.

The most comprehensive collection of accurate astronomical algorithms in (C++, Objective-C and) Swift.

KSP Trajectory Optimization Tool

Adhan for Dart / Muslim Prayer Times Library. Now retrieving Prayer time in Dart easier than ever.

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Geo-Astronomical library for artist

Arduino library to calculate the times of sunrise, sunset, solar noon, twilight, the solar position, and more.

Astrology Calculator calculates moon's rise/set times, moon Age, moon phases and Zodiac Sign for location and time

The science fiction calculation spreadsheet

X-PSI: X-ray Pulse Simulation and Inference

The Astrobook source files

Astrarium — open-source planetarium software for Windows

NASA/JPL SPICE Toolkit for C – patched for cross-platform compatibility

GUI application for calculating human-visible colors of celestial bodies from their photometric data

GPU Framework for Radio Astronomical Image Synthesis

Containerized radio interferometry scripting framework -- NB: Classic version is no longer in active development, use stimela 2! See README for details.

arduino library to calculate moon day and sunrise and sunset times

Parallelized rotation and flipping INvariant Kohonen maps

Chinese Calendar in calendar(1) for BSD, Linux & macOS

A Python package for manipulating and correcting variable point spread functions.

A modern, high-performance and comprehensive set of tools for transformations between any standard and user-defined reference frame.

A Python package for working with pipeline-produced spectra from IGRINS, HPF, and Keck NIRSPEC

The Orbitronomy library is designed to simplify the process of plotting, calculating, visualizing, and animating the orbits of celestial bodies in 3D space. It employs Kepler's elliptical orbit equations and Keplerian Elements, in conjunction with PyAstronomy and Matplotlib, to perform precise orbital calculations.

Efficient Astronomical Time transformations in Julia.

Yandasoft (deprecated)

Getting Planets Position using PHP & AstroDienst Swiss Ephemeris library.

Provides web-based star charts and astronomical information.

General Astronomy library for advanced Arduino platforms

Lunar Phase Calculation Based on Time

Orbital mechanics on minor planets using golang