The Colas c31.30

c31.30

The year is reckoned generally at 360 days, but instances also occur where calculations are based on a year of 365 days.⁹⁷ It is well known that Hindu astronomical works like the *Sūryasiddhānta* and the *Siddhānta Śirōmaṇi* mention, among others, both these reckonings and prescribe the particular purposes for which each may be used. In the Cōḷa inscriptions, however, we find both reckonings used for the same purpose, *e.g.*, for calculating the quantity of *ghī* necessary for the maintenance of lamps.