Calculation of Kali Days

Ahargana is defined as the no of days elapsed after the start of the Iron Age, the Kali Yuga, which began on 3102 BC.

Kali Era = English Era +3102

The no of days elapsed from Kali Start was 1822903 on 01/01/1890.

Hence

Ahargana, d = ( xdate - 01/01/1980 ) + 1822903
where xdate is the date of birth.

This Ahargana is printed on every V A Horoscope. All calculations in Indian Astronomy is based on Ahargana. Ahas means day in Sanskrit and gana means calculation.

The present Kali Era is therefore
3102 + 2010 = 5112

The difference between the Malayalam & English eras are 825. Malayalam Era is 1185 now and if you add 825 to Malayalam Era, you get English Era.

The Julian Calender used the value 365.25 d ( days ) for year and was proved erroneous. There were 10 days difference and the Gregorian Calender, the present day Calender, came into being. Gregorian uses 365.2425 d for year. The Gregorian is also not perfect, as the Tropical Zodiac is moving, and may be subject to correction after some years. The actual value of the year is

year = 365.256362424815 d

with twelve decimals. In my early days of progam development, I used two decimals and there were many days of difference. This value is given by Sir Simon Newcombe, according to Western Learning and Aryabhata, according to Indian learning.