Lunar month with the Sun one or two days before that evening ("e.g.", in the Islamic calendar). In ancient Egypt the lunar month began on the day when the waning moon could no longer be seen just before sunrise. Others use calculation, of varying degrees of sophistication, "e.g.", the Hebrew calendar or the ecclesiastical lunar calendar. Yet others run from full moon to full moon. Calendars count integer days, so months may be 29 or 30 days in length, in some regular or irregular sequence. In India the month from conjunction to conjunction is divided into thirty parts known as "tithis". The
Siṃha month of Karkaṭa, and followed by the solar month of Kanyā. The Simha month is called "Avani" in the Tamil Hindu calendar. 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. In contrast, the "Arya Siddhanta" calculates the duration of the Simha month to be 31 days, 2 hours, 5 minutes and 31 seconds. The Indian solar month