Oroboros – Astrology Ephemeris Swisseph

Oroboros is an open source astrology software written in Python.

It is based on the Swiss Ephemeris (pyswisseph) for planetary calculations, the Olson timezone database (pytz) for date and time resolution, the atlas database, and the Qt4 toolkit (PyQt4) for the graphical user interface.

The software also uses reStructured Text for charts comments, and the lightweight Source Control Management system, Mercurial, as a mirroring system for chart directories.

Oroboros uses a flexible configuration system with a large panel of planets and aspects, midpoints, heliocentric and topocentric charts.

It requires Python version 2.5 or higher.

Features include:

  • Charts: natal/radix, transits, progression, harmonics, profection.
  • Open Astrolog or Skylendar charts.
  • Save charts as images in various formats (png, jpg, bmp, svg,…).
  • Query the online atlas database.
  • Calculates all planets, nodes.
  • More than 300 fixed stars.
  • Asteroids (Eris, Quaoar, Sedna, etc).
  • Uses Swiss, JPL, or Moshier Ephemeris.
  • A flexible and powerful configuration system.
  • Geocentric, topocentric, heliocentric or barycentric charts.
  • Various house systems, including Gauquelin sectors.
  • Tropical or sidereal zodiacs.
  • Midpoints calculations and drawings.
  • Format comments with Docutils reStructured Text.
  • Synchronize your charts with a distant repository (using Mercurial).
  • A few toys for IRC chat addicts (Supybot plugin).
  • Easy extension capabilities with the Python language.

Developer: S. Marquis and contributors
License: GNU General Public License v3.0


Oroboros is written in Python. Learn Python with our recommended free books and free tutorials.

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