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Ayanamsa Calculator (Lahiri)

Find the Lahiri ayanamsa for any date — the angular offset between the tropical and sidereal zodiacs, caused by the precession of the equinoxes. Date-only; no birth time or place needed.

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The ayanamsa depends only on the date — no place or time required.

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How the ayanamsa is calculated

The ayanamsa is the gap between the tropical zodiac (fixed to the seasons) and the sidereal zodiac (fixed to the stars). Because the Earth's axis precesses about 50.3 arc-seconds per year, this gap grows slowly over time. This tool computes the Lahiri (Chitrapaksha) ayanamsa — the standard adopted in India — for the date you choose, expressed in degrees and minutes. Subtracting the ayanamsa from a tropical position gives the sidereal position used in Vedic astrology.

Frequently asked questions

What is the ayanamsa?
The ayanamsa is the angular difference between the tropical and sidereal zodiacs on a given date. It is subtracted from tropical positions to obtain the sidereal positions used in Vedic astrology.
Why does the ayanamsa change over time?
Because of the precession of the equinoxes — a slow wobble of the Earth's axis that shifts the vernal equinox roughly 50.3 arc-seconds westward each year, gradually widening the gap between the two zodiacs.
What is the Lahiri ayanamsa?
Lahiri (also called Chitrapaksha) is the ayanamsa officially adopted by the Indian government and the most widely used in Jyotish. It is the default in this engine.
Are there other ayanamsas?
Yes. Schools differ slightly — the Raman and Krishnamurti (KP) ayanamsas are common alternatives — but the values are close, and Lahiri is the standard used here.
Do I need a birth time or place?
No. The ayanamsa depends only on the date, so this calculator asks for a date alone.