Ephemeris Python Packages

spiceypy

SpiceyPy: a Pythonic Wrapper for the SPICE Toolkit.

kerykeion

Data-Driven Astrology 💫 Kerykeion is a Python library for astrology. It generates SVG charts and extracts detailed structured data for birth charts, synastry, transits, composite charts, and more.

anise

A thread-safe, zero-cost alternative to NASA SPICE toolkit, computing spacecraft, planetary, coordinate frame, instrument transformations, ground station visibility, and orbital elements. Engineered for high-throughput Python concurrent execution and flight software, with proven lunar flight heritage.

moira-astro

Astronomy-first pure-Python ephemeris and astrology computation engine with transparent, auditable calculations.

libephemeris

NASA-powered Python library for high-precision astrological ephemerides. Features an API compatible with Swiss Ephemeris (pyswisseph) and utilizes Skyfield for professional-grade celestial calculations and orbital data.

kosmorrolib

Kosmorrolib, a library to calculate ephemerides.

calcchinesecalendar

High-precision Chinese lunar calendar tool based on JPL DE ephemeris.

stellium

A modern Python library for astrological chart calculation, visualization, reporting and data analysis. Built on the Swiss Ephemeris for astronomical accuracy.

astronomia

Python package to calculate ephemeris of Sun, Moon, and planets.

orbit-formats

Lossless round-trip across orbital state-vector and ephemeris formats — TLE, CCSDS NDM, SP3, SPK, STK ephemeris, GMAT report.

planetmapper

PlanetMapper: An open source Python package for visualising, navigating and mapping Solar System observations

gmat-run

Run GMAT mission scripts from Python and get results as pandas DataFrames.

almanac-compute

Deterministic, verifiable ephemeris + geomagnetic computation — the physical numbers LLMs hallucinate, computed correctly and checked against NOAA & JPL.

azely

:zap: Azimuth/elevation calculator for astronomical objects

spacetracktool

A Python class for making requests to space-track.org

eph

Represent, retrieve and manipulate ephemerides with python.

pyplanets

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

ephemeris-mcp

Precision astronomical ephemeris for AI agents. An MCP server providing planetary positions via the Swiss Ephemeris.

xalen

Pure-Rust astronomical ephemeris for astrology — Vedic, Western, Chinese, and 9 world traditions

swisseph-ffi

Pure Python ctypes FFI wrapper for the Swiss Ephemeris C library

starward

An educational astronomy calculation toolkit with a soul. Show your work with --verbose mode. Sun/Moon positions, rise/set times, twilight, phases, coordinate transforms, Julian dates, and visibility planning. Pure Python, no compiled dependencies.

jmeph-ffi

Pure Python ctypes FFI wrapper for the JPL Moshier Ephemeris native library with direct jme_* API access and bundled jme plus calceph runtimes

starlight-astro

A modern Python library for astrological chart calculation, visualization, reporting and data analysis. Built on the Swiss Ephemeris for astronomical accuracy.

ewia

A library to calculate astrophysical object positions