Data driven Astrology 💫
Kerykeion is a python library for astrology. It can generate SVG charts and extract all data about a birthchart, a synastry chart and a transit chart.

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.

Geo-Astronomical library for artist

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

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

The science fiction calculation spreadsheet

The Astrobook source files

X-PSI: X-ray Pulse Simulation and Inference

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

Astrarium — open-source planetarium software for Windows

Parallelized rotation and flipping INvariant Kohonen maps

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

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

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

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