cosinekitty/astronomy
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. observed · 2026-10-11
Health v2 · maintenance only
23/100
- Activity 0
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 2753
- days_rel: n/a
- days_push: 631
- n_releases_24m: 0
Adoption not part of the score
1047 stars · 140 forks observed · 2026-10-11
What it is AI-extracted, prompt v1, taxonomy v1, 2026-09-07, confidence 0.95
Astronomy Engine is a multi-language library for calculating positions of the Sun, Moon, and planets, and predicting astronomical events like eclipses, lunar phases, and rise/set times. It provides coordinate transforms among equatorial, ecliptic, horizontal, and galactic systems with ports for C/C++, C#, JavaScript, Python, and Kotlin/JVM.
Use cases
- calculate sun and moon positions for a date and location
- predict lunar phases and eclipses
- compute sunrise and sunset times
- convert between equatorial, ecliptic, and horizontal coordinates
- find planetary conjunctions and oppositions
- determine equinoxes and solstices
- build an astronomy app without a server-side ephemeris
When to choose
- you need accurate astronomical calculations in multiple programming languages from one codebase
- you want a lightweight, dependency-free ephemeris with an MIT license
- you need event predictions like eclipses, transits, or rise/set times
When to avoid
- you need professional-grade ephemeris accuracy for scientific publication
- you require deep-sky object catalogs or star charts
- you need real-time telescope control or astrophotography features
Facets
library · maturity stable
math sdk developer-tools astronomy cross-platform cross-platform c cpp python jvm dotnet browser cli astronomy-engine ephemeris celestial-mechanics lunar-phases eclipses coordinate-transforms multi-language algorithms nodejs
1 source
- readme: https://github.com/cosinekitty/astronomy · fetched 2026-10-11 · 53f8b81569ce
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| cosinekitty/astronomy | main | 23 |
For agents
markdown · JSON · MCP: product_card(name="cosinekitty/astronomy")
Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem