Kumbha (month) of Mīna. The solar month is significant because it inspires the name of the 12-year cycled Kumbha Mela, where Hindu pilgrims gather by tens of millions to one of four pilgrimage sites, in the weeks before it starts. The Kumbha month is called "Masi" in the Tamil Hindu calendar. The ancient and medieval era Sanskrit texts of India vary in their calculations about the duration of Kumbha, just like they do with other months. For example, the "Surya Siddhanta" calculates the duration of Kumbha to be 29 days, 19 hours, 41 minutes and 12 seconds. In contrast, the "Arya Siddhanta"
Lunar month Terrestrial Time) with days of 86,400 SI seconds. "Y" is years since the epoch (2000), expressed in Julian years of 365.25 days. For calendric calculations, one would probably use days measured in the time scale of Universal Time, which follows the somewhat unpredictable rotation of the Earth, and progressively accumulates a difference with ephemeris time called Δ"T". Apart from the long term (millennial) drift in these values, all these periods vary continually around their mean values because of the complex orbital effects of the Sun and planets affecting its motion. Lunar month In lunar calendars, a lunar month is the