[1] The ancient and medieval era Sanskrit texts of India vary in their calculations about the duration of Simha, just like they do with other months.
For example, the Surya Siddhanta, dated to c. 400 CE, calculates the duration of Simha to be 31 days, 0 hours, 26 minutes and 48 seconds.
[6] In contrast, the Arya Siddhanta calculates the duration of the Simha month to be 31 days, 2 hours, 5 minutes and 31 seconds.
[6] The Indian solar month names are significant in epigraphical studies of South Asia.
The Pandya King Jatavarman Sundara-Pandaya II dedicated the Kalisvara temple at Kalayar Kovil in his 12th year of reign, reads one inscription, on the third tithi of the second fortnight of the Simha month, which corresponds to Wednesday August 27, 1287.