PyPI100Exceptionalhealth index
Python · C★ 5,288↓ 3.4M/moAug 28, 2026
PyPI97Exceptionalhealth index
asdf-format/asdfASDF (Advanced Scientific Data Format) is a next generation interchange format for scientific data
Python★ 563Jul 26, 2026
PyPI94Exceptionalhealth index
Python★ 283↓ 9,194/moJul 19, 2026
PyPI92Excellenthealth index
Python · C★ 281Jul 26, 2026
PyPI90Excellenthealth index
Python · C★ 48↓ 3.6M/moAug 27, 2026
PyPI89Excellenthealth index
Python★ 15Jul 21, 2026
PyPI87Excellenthealth index
Python★ 184↓ 7,997/moJul 19, 2026
PyPI87Excellenthealth index
Python★ 13↓ 43K/moSep 6, 2026
PyPI84Excellenthealth index
Fortran★ 159Aug 16, 2026
npm81Excellenthealth index

simiancraft/unitforgeForge anything measurable. A units library that does not assume you are doing physics.
TypeScript★ 4↓ 6,301/moSep 1, 2026
PyPI80Excellenthealth index

TheDaniel166/moiraAstronomy-first pure-Python ephemeris and astrology computation engine with transparent, auditable calculations.
Python★ 33↓ 9,470/moSep 5, 2026

isbeorn/ninaN.I.N.A. (Nighttime Imaging 'N' Astronomy) - Advanced astrophotography sequencing software for Windows, supporting full automation of imaging sessions.
C# · C★ 224Aug 23, 2026
Python★ 4Jul 17, 2026
mourner/suncalcA tiny JavaScript library for calculating sun/moon positions and phases.
JavaScript★ 3,411↓ 1M/moJul 18, 2026
TypeScript★ 0↓ 2,925/moAug 5, 2026

observerly/astrometryobserverly’s lightweight, zero-dependency, type-safe astrometry library for TypeScript. Accurately determine the positions of the Sun, Moon, and planets, handle coordinate transformations with ease, calculate transit times for any celestial object, and integrate precision astronomy into your projects with clean, dependency-free code.
TypeScript★ 29↓ 2,220/moAug 5, 2026

moble/scriPython/numba code for manipulating time-dependent functions of spin-weighted spherical harmonics on future null infinity
Python · Jupyter Notebook★ 23↓ 5,972/moSep 5, 2026
crates.io73Goodhealth index
Rust★ 1↓ 2,151/moAug 27, 2026
crates.io73Goodhealth index
Rust★ 0↓ 2,523/moJul 25, 2026
TuSKan/astrogoPure Go Astropy-inspired astronomy and observatory-planning toolkit
Go★ 1Jul 17, 2026
PyPI63Moderatehealth index
Python★ 7↓ 5,368/moAug 1, 2026
PyPI63Moderatehealth index
anhydrous99/zigfitsioA pure-Zig implementation of the FITS 4.0 astronomical data format, with feature parity goals against CFITSIO - no C import, no C sources.
Zig · TypeScript · Python★ 0↓ 7,409/moJul 18, 2026
PyPI60Moderatehealth index
Python · C++★ 271Jul 21, 2026
NuGet60Moderatehealth index

Occurify/OccurifyA powerful and intuitive .NET library for defining, filtering, transforming, and scheduling instant and period timelines.
C#★ 78Sep 5, 2026
PyPI60Moderatehealth index

g-battaglia/libephemerisHigh-precision Python ephemeris — NASA JPL DE440/DE441 via Skyfield, Swiss-Ephemeris independent, compatible API.
Python★ 15↓ 1,417/moAug 22, 2026
crates.io · PyPI60Moderatehealth index
Rust★ 2↓ 1,027/moJul 22, 2026
crates.io59Moderatehealth index
Rust★ 5↓ 2,206/moAug 15, 2026
npm57Moderatehealth index
prolaxu/swisseph-wasmA high-precision JavaScript wrapper for the Swiss Ephemeris WebAssembly module, providing professional-grade astronomical calculations for astrology, astronomy, and related applications.
JavaScript · C★ 35↓ 7,393/moJul 30, 2026
npm57Moderatehealth index
TypeScript★ 0↓ 2,473/moJul 26, 2026
PyPI56Moderatehealth index
Python★ 92Jul 16, 2026