Ayanamsa
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Ayanamsa is the sanskrit term for the longitudinal difference between the tropical or Sayana and sidereal or Nirayana zodiacs.
From the Hindu word ayana which means the arc it translates literally as "yearly degree" and more precisely as precession. It describes the increasing gap between the tropical and sidereal zodiacs. The ayanamsa, changes continually through the Precession of the Equinoxes at the rate of approximately 50" a year, is currently about 24°.
Western Astrologers Fagan and Bradley computed it at 24 degrees in 1950 but there are various values in use in India. Differences arise because of the indefinate ancient boundaries of the constellation of Aries.
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