Vṛścik‌‌‌a preceded by the solar month of Tulā, and followed by the solar month of Dhanu. The Vrschika month is called "Kartigai" in the Tamil Hindu calendar. The ancient and medieval era Sanskrit texts of India vary in their calculations about the duration of Vrschika, just like they do with other months. For example, the "Surya Siddhanta" calculates the duration of Vrschika to be 29 days, 11 hours, 46 minutes and 0 seconds. In contrast, the "Arya Siddhanta" calculates the duration of the Vrschika month to be 29 days, 12 hours, 12 minutes and 24 seconds. The Indian solar month names
Lunar month month because it is the cycle of the visible phases of the Moon. Most of the following types of lunar month, except the distinction between the sidereal and tropical months, were first recognized in Babylonian lunar astronomy. The period of the Moon's orbit as defined with respect to the celestial sphere of apparently fixed stars (nowadays the International Celestial Reference Frame (ICRF)) is known as a sidereal month because it is the time it takes the Moon to return to a similar position among the stars (): days (27 d 7 h 43 min 11.6 s). This type of month