How we compute

Every free tool here is shastra-correct, computed live from a real ephemeris. Specifically:

• Ephemeris: Swiss Ephemeris (Moshier mode, no external data files) — the same library used by professional Vedic-astrology software for decades.
• Ayanamsa: Lahiri / Chitrapaksha (the modern Indian government standard).
• House system: Whole-sign (the classical Vedic system used in BPHS and Phaladeepika).
• Sunrise / sunset: computed live from the actual coordinates and timezone of the location you enter — not a static almanac table.
• Citations: result pages cite the classical source texts (Brihat Parashara Hora Shastra, Phaladeepika, Brihat Jataka, Saravali, Hora Sara, etc.) that the interpretations are based on.
• Open verification: where useful, result pages surface the computed values (ayanamsa, sunrise, key positions) so you can verify the math.

If you spot a result that disagrees with another verified source, please tell us.