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 the Northern Celestial Hemisphere, and the "descending node", where the Moon moves into the Southern. The draconic or nodical month is the average interval between two successive transits of the Moon through the same node. Because of the torque exerted by the Sun's gravity on the angular momentum of the Earth–Moon system, the plane of the Moon's orbit gradually rotates westward, which means the nodes gradually rotate around Earth. As a result, the time it takes the Moon to return to the same node is shorter than a sidereal month, lasting days (27 d 5 h 5 min 35.8 s).