Astronomy

• Stellarium is opensource (launchpad, github). It comes with a developing “Indian vedic skyculture”, and allows translations with voting (rosetta).

Ephemeris data

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• DExxx ephemerides from NASA’s JPL

Swiss ephemeris

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• Swiss Ephemeris is based upon the planetary and lunar ephemeris DE431 developed by NASA’s Jet Propulsion Laboratory, compressed.
• Mailing list - swisseph/
• Test page - here.
• Python wrapper - pyswisseph. git here.

Vedic astrology extensions

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• M. YANO and M. FUSHIMI here (cached here.)
• jagannatha hora - Narasimha rao
• mudgala hora - ajit

Python

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• jyotisha - kArttika.
• drik-panchanga well-written Python-based panchangam, with a nice simple GUI

Online services

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• drikpanchang
• prokerala