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Jyotisha — the sidereal zodiac of India, fixed to the stars rather than to the seasons.

Facts & lineage · ayanamsa

Sidereal still needs a zero

Ayanamsa is the angular separation between the seasonal and sidereal zero points. Different schools choose different reference stars or historical anchors, so a calculator that says only “Vedic” has hidden an input.

Why this calculator says Lahiri

The Indian Calendar Reform Committee fixed the reference at 23°15′ on 21 March 1956. Lahiri remains the official setting used for the Indian Astronomical Ephemeris. Bodhastra anchors there and propagates the angle with the IAU P03 precession model.

That is a transparent implementation choice, not a claim that every Jyotisha school agrees with it. Near a boundary, compare the ayanamsa used by the school you follow.

Independent check

Published mean Lahiri values against this implementation.
datepublishedcomputeddifference
1950-01-0123.1583°23.1632°0.29′
1956-03-2123.2500°23.2500°0.00′
2000-01-0123.8567°23.8615°0.29′
2025-01-0124.2067°24.2108°0.25′
2050-01-0124.5550°24.5601°0.30′

Fixtures transcribed from N. C. Lahiri’s Advance Ephemeris; the 1956 anchor comes from the Calendar Reform Committee report.

Bodhastra documents what astrological traditions have said, and when they started saying it. It is presented as cultural history and entertainment. Nothing here is medical, psychological, financial or predictive advice, and nothing here is a claim about what will happen to you.

Every source, listed

Place data from GeoNames, used under CC BY 4.0.