Ayanamsa (ayanāṃśa: from Sanskrit ayana 'movement' and aṃśa 'component'), alsoayanabhāga (from Sanskrit bhāga 'portion'), is theSanskrit term for many systems used inHindu astrology to account for theprecession of equinoxes.[1][verification needed] There are also systems of ayanamsa used inWestern sidereal astrology, such as the Fagan/Bradley Ayanamsa.[2]
There are various systems of Ayanamsa that are in use in Hindu astrology (also known asVedic astrology) such as theRaman Ayanamsa[3] and the Krishnamurthy Ayanamsa,[1] but the Lahiri Ayanamsa, named after itsinventor,astronomer N.C. Lahiri, is by far the most prevalent system in India.[2][4] Critics of Lahiri Ayanamsa have proposed an ayanamsa called True Chitra Paksha Ayanamsa.[2][4] There are other existing ayanamsa such as Raman, Pushya Paksha, Rohini, Kërr A.I, Usha Shashi and Chandra Hari.
The use of ayanamsa to account for the precession of equinoxes is believed to have been defined inVedic texts[which?] at least 2,500 years before theGreek astronomerHipparchus quantified the precession of equinoxes in 127 B.C.[citation needed]
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