Lahiri Ayanamsha
Also known as: Chitra Paksha Ayanamsha, Indian Government Standard
The Lahiri ayanamsha is the official ayanamsha used by the Indian government for almanac publication and the most widely used standard in modern Vedic astrology.
Named after astronomer N. C. Lahiri, this ayanamsha was adopted by the Calendar Reform Committee of India in 1955. It is calibrated so that the sidereal longitude of the star Spica (Chitra) is exactly 0° Libra (Tula). The current Lahiri ayanamsha value is approximately 24°15′. Most major Vedic astrology software (including KundliAI), the official Rashtriya Panchang, and almost all Indian astrologers default to Lahiri. Alternative ayanamshas — Raman, Krishnamurti (KP), Fagan-Bradley, Sri Yukteshwar — produce planet positions that can differ from Lahiri by anywhere from a few arc-minutes to nearly a full degree, occasionally enough to shift a planet into a different sign.
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