Computation of Ayanamsa

In India, Chaitra Paksheeya Ayanamsa is widely followed. The Indian Govt gave the job of standardising the Almanacs to the great N C Lahiri. It is also known as Lahiri's Ayanamsa.

The Year of Coincidence of the Tropical and the Sidereal Zodiacs was at 285 AD, according to Chaitra Paksheeya Ayanamsa. There are 13 other Ayanamsas, with different scholars differing as to the dates. The great Dr B V Raman opined that the two Zodiacs coincided at 398 ACE, but the followers of Chaitra Paksha Ayanamsa are more.

According to Cheiro, the Precession was one degree in every 72 years.

According to C P A, the precession is 50.24645 secs per year.

Mathematically

y = year(xdate)-Year of Epoch

x = 50.25645+(.00022229)*y + ((0.00000000027)*y^2)

Chaitra Paksha Ayanamsa = 22.436+ (x/3600)*y