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There are several types of lunar month. The term lunar month usually refers to the synodic 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.
Because 0.36826 is between 1 ⁄ 3 and 1 ⁄ 2, a typical year of 12 months needs to be supplemented with one intercalary or leap month every 2 to 3 years. More precisely, 0.36826 is quite close to 7 ⁄ 19 (about 0.3684211): several lunisolar calendars have 7 leap months in every cycle of 19 years (called a ' Metonic cycle ').
Since each lunation is approximately 29 + 1 ⁄ 2 days, [1] it is common for the months of a lunar calendar to alternate between 29 and 30 days. Since the period of 12 such lunations, a lunar year, is 354 days, 8 hours, 48 minutes, 34 seconds (354.36707 days), [1] purely lunar calendars are 11 to 12 days shorter than the solar year.
Hmong people build the cây nêu in the Gầu Tào festival from the 3rd to the 5th day of the first lunar month, the 7th day of the first lunar month is the summer day, the San Diu people build the cây nêu in the Cầu Mùa Festival. [1] Viet people usually cut down a cây nêu on the 7th day of the 1st lunar month, called Lễ khai hạ. [2]
North Vietnam switched from UTC+8 to UTC+7 on 8 August 1967, with southern Vietnam doing likewise in 1975 at the end of the Vietnam War. As a result of the shift, North and South Vietnam celebrated Tết 1968 on different days. [5] This effect would see the solstice falling on 21 December in Hanoi, while it was 22 December for Beijing.
The Synodic months are used to compose the years while the 27 lunar sidereal days (Sanskrit: nakshatra), alongside the 12 signs of the zodiac, are used for astrological calculations. [6] (The Burmese calendar also recognizes a solar month called Thuriya Matha, which is defined as 1/12th of a year. [7] But the solar month varies by the type of ...
The formal lunar day is therefore the time of a full lunar day-night cycle. Due to tidal locking, this equals the time that the Moon takes to complete one synodic orbit around Earth, a synodic lunar month, returning to the same lunar phase. The synodic period is about 29 + 1 ⁄ 2 Earth days, which is about 2.2 days longer than its sidereal period.
Each lunar year has a 12 lunar months, six months of 30 days and five of 29 days, although not in 29/30 pairs, and one variable month of 29 or 30 days. A synodic month has 29.53 days, so the calendar overcomes any slight slippage or temporary imbalance by the month of MID EQVOS having either 29 or 30 days as required to keep the calendar in ...