Calculator software

Our in-house calculation software uses Swiss Ephemeris and is available under the GNU Affero General Public License, version 3 or later.

Download the source code · Software licence

Astronomy: Swiss Ephemeris, Astrodienst AG, through the sweph Node binding. Birthplace data: GeoNames, modified and used under CC BY 4.0. Source provenance and build instructions are included in the download.

This calculator uses Lahiri ayanamsa, whole-sign houses and Vimshottari periods with a 365.25-day year. Its default uses mean lunar nodes. Divisional placements describe the D9 transformation. Historical timezone records and birth-time precision can affect a chart.