In Hindu cosmology, kala (time) is eternal, repeating general events in four types of cycles. The smallest cycle is a maha-yuga (great age), containing four yugas (dharmic ages): Satya Yuga, Treta Yuga, Dvapara Yuga and Kali Yuga. A manvantara (age of Manu) contains 71 maha-yugas. A kalpa (day of Brahma) contains 14 manvantaras and 15 sandhyas (connecting periods), which lasts for 1,000 maha-yugas and is followed by a pralaya (night of partial dissolution) of equal length, where a day and night make one full day. A maha-kalpa (life of Brahma) lasts for 100 of Brahma's years of 12 months of 30 full days (100 360-day years) or 72,000,000 maha-yugas, which is followed by a maha-pralaya (full dissolution) of equal length.