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The Vietnamese zodiac (Vietnamese: Mười hai con giáp) is the traditional Vietnamese classification scheme based on the lunar calendar that assigns an animal and its reputed attributes to each year in a repeating 12-year cycle. The Viet lunar calendar is divided into 60-year cycles known as hồi. Each of these consists of five 12-year ...
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. In purely lunar calendars, which do not make use of intercalation, the lunar months cycle through all the seasons of a solar year over the course of a 33 ...
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 .
Introduced by the Ming dynasty in 1369, during the Fourth Chinese domination of Vietnam, the Ming administration in Vietnam used the Datong calendar. At the start of the Vietnamese Lê dynasty in 1428, the end of Chinese domination over Vietnam, the calendar was not changed. [3] The calendar was calculated using the same method as the Datong ...
The classic Metonic cycle can be reproduced by assigning an initial epact value of 1 to the last year of the cycle and incrementing by 11 each year. Between the last year of one cycle and the first year of the next the increment is 12 – the saltus lunae (Latin for 'leap of the moon') – which causes the epacts to repeat every 19 years. When ...
The Moon then wanes as it passes through the gibbous moon, third-quarter moon, and crescent moon phases, before returning back to new moon. The terms old moon and new moon are not interchangeable. The "old moon" is a waning sliver (which eventually becomes undetectable to the naked eye) until the moment it aligns with the Sun and begins to wax ...
Tết begins on the first day of lunar January, marking the start of a new year and a new farming cycle. [10] Historian Trần Văn Giáp asserts that there are many ways to divide time into months and years. From the beginning, each ethnic group had its own way of dividing months and years.
The (19-year) Metonic cycle is a lunisolar cycle, as is the (76-year) Callippic cycle. [8] An important example of an application of the Metonic cycle in the Julian calendar is the 19-year lunar cycle insofar as provided with a Metonic structure. [9] Meton introduced the 19 year cycle to the Attic calendar in 432 BC.