meeus

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.

A Swift package for astronomy

Java port of Ephemeris calculations by Peter Hayes

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.

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

Caelis Engine, Deterministic astronomical computation engine for JavaScript. VSOP87B + ELP/MPP02-LLR. No server. No API key. No dependencies. Schema v3.1.

Offline-first wilderness tools that run entirely in your browser — sun, moon, orientation, knots and distress signalling, with no backend, no account and no build step.

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

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

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

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

Zero-dependency Go package for astronomical calculations: sunrise/sunset, moonrise/moonset, twilight, and lunar phase, based on Meeus.

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