Source code (AGPL)
The astronomical calculations of this website are done by a separate service, Ratnayog.Ephemeris, which uses the Swiss Ephemeris and is licensed under the GNU Affero General Public License v3.0 (AGPL).
You can download the complete source code of that service here:
Write to info@ratnayog.com to receive the source code.
Swiss Ephemeris © Astrodienst AG, Switzerland. Place data: GeoNames (CC BY 4.0).