A library designed to ease geographic coordinate format conversions, and determine sun/moon information in C#

An astronomical library

Library of astronomical algorithms in Python

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

Java port of Ephemeris calculations by Peter Hayes

A Swift package for astronomy

Javascript library for positional astronomy

C# Astronomy Library

Library of astronomical algorithms in Python to compute planets ephemeris and phenomena

Custom solar eclipse viewer, with lots of info about the eclipse specific to your location.

A Rust native library for astronomical calculations, a libnova-oxi shortly

Independent C ephemeris engine with JPL/CALCEPH, Moshier, VSOP87, ELP2000, Meeus, eclipse, and astrology/astronomy APIs.

The engineering reasoning behind Kriya — accuracy disclosure, Moon-residual analysis, and API-versioning contract. Public companion to the proprietary engine.

3D solar eclipse predictor — NASA catalog dates, paths computed live with Meeus/ELP-2000, single HTML file, Three.js

🔭 Ephemeris is a .NET library for astronomical calculations — from Julian dates to sunsets, planetary positions to eclipses.

Public case study for the Insights Astrology API — a commercial astronomy API built from first principles. Architecture, decisions, accuracy disclosure, source policy. No proprietary code.

PHP FFI wrapper for the JPL Moshier Ephemeris native library with JME API, runtime binaries, and JPL kernel support.