Thus, the average length of the year will be approximately equal to 354.366(6) days, and the month will be equal to 29.5305(5) days, which is much closer to the length of the synodic month. Thus, every 30 years contains 19 normal years of 354 days and 11 leap years of 355 days. Leap years follow a 30-year cycle and fall on the 2, 5, 7, 10, 13, 16, 18, 21, 24, 26, and 29 years of the cycle. Without the introduction of leap years, the average duration of the year's months would be strictly 29.5 days, which would give us a big error. The last month consists of 29 days, and during a leap year is extended to 30 days. The well-known Gregorian calendar is solar, but the Muslim calendar is lunar.Ī year in the Muslim calendar consists of 12 months, which alternate between 30 and 29 days. Synodic month - the period of the Moon revolution around the Earth between the two new moons.ĭuration of the synodical month - 29.53059 daysĭuring the synodical month, there is a complete change of phases of the moon. Lunar calendar - calendar, which is based on the synodic month. Tropical year - the time interval between two successive passages of the Sun through the vernal equinox.ĭuration of the tropical year - 365,242196 daysĭuring the tropical year, there is a complete change of seasons. Solar calendar - calendar, which is based on the tropical year. Traditionally, here is some information(I've actually discovered all this just now).
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