Ayanamsa Formula

In this small notes a formula to calculate Ayanamsa for a given date is given:

For the beginning of the year:

For the beginning of the year:

A = 16.90709 x Year/10000 - 0.757371 x Year/1000 x Year/1000 - 6.92416100010001000

For any other date and month add the following also to get the correct
Ayanamsa.

B = (Month-1 + date/30) X 1.1574074/1000

Ayanamsa = A + B

Let us calculate the Ayanamsa for 15-7-2009 (15th July 2009)

We have year = 2009, month = 7 (July = 7), date = 15

First we will calculate the value of ‘A’

A = 16.90709 x 2.009/1000 – 0.757371 x 2.009/1000 x 2.009/1000 - 6.92416

A = 33.96634381 – 3.056810703 - 6.92416

A = 23.9853731

Now we calculate the values of ‘B’

Using the formula B above, we get the following

B = 6.5 x 1.1574074/1000= 7.5231481/1000

B = 0.0075231481

Ayanamsa = A + B = 23.9853731 + 0.0075231481 = 23.9928962