What is a karanagrantha?

What is a karanagrantha?

In a karanagrantha, a certain year is taken as the starting year. The positions for the celestial bodies etc are given for that year. And then methods are given for calculating these in the succeeding years. Reference

• The base year taken by Varahamihira was 427 Saka Era.
• That taken by Vatesvara was 821 Saka Era.
• Both of them possibly referred to different Saka Eras.: See How many kinds of Sakas (Eras) are there?

1. 4000 Kaliyuga is the basis of the karanagrantha used by Vateswara. (See : Al Biruni : Kaliyuga , Saka Kala conversion)
2. 3000 Kaliyuga must be the basis of the Karanagrantha used by Varahamihira.
3. In terms of Vatesvara’s Saka Era, 3000 Kaliyuga is minus 179 Saka Era.
4. This means 179 year before the Sakakarta considered by Vatesvara.
5. 3000 Kaliyuga  was 427 in Varahamihira’s Saka Era.
6. Therefore Varahamihira’s Saka Era started 606 years before Vateswara’s Saka Era.
7. 1000 = 821-427 + x; x = 606;

The dates for the Karanagranthas must have been,

• 0 kaliyuga : 3102 BCE
• 1000 Kaliyuga : 2102 BCE
• 2000 Kaliyuga : 1102 BCE
• 3000 Kaliyuga : 102 BCE (427 (different) Saka Era referred by Varahamihira)
• 4000 Kaliyuga : 898 CE (821 Saka Era referred by Vatesvara)
• 5000 Kaliyuga : 1898 CE
• 6000 Kaliyuga : due  2898 CE

See How many kinds of Sakas (Eras) are there?

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