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Legend has it that the Emperor Huangdi invented the calendar in 2637 B.C.  The Chinese calendar counts years in cycles of 60 years, containing 12 animal months repeated five times.  Historically, years were counted since the accession of an emperor, but this was abolished after the 1911 revolution.

See also:  Chinese astrology,  Chinese New YearcalendarsTetmoonsun

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Chinese calendar description

Although the calendar varies in various Chinese communities, the Chinese calendar years try to coincide with the tropical year and its months try to coincide with the synodic months.  An ordinary year has 12 months (353, 354, or 355 days) and a leap year has 13 months (383, 384, or 385 days), like the Hebrew calendar.  The new moon (when the moon is in conjunction with the sun) is the first day of a new month.  The Chinese new moon is when the sky is still black, unlike the Hebrew and Islamic calendars.

The Principal Terms are the number of days in each month.  It is determined by when the sun's longitude is a multiple of 30 degrees using a meridian 120 degrees east of Greenwich (the east coast of China).
 Principal Term 1 - the sun's longitude is 330 degrees
 Principal Term 2 - the sun's longitude is 0 degrees
 Principal Term 3 - the sun's longitude is 30 degrees
... etc. ...
 Principal Term 11 (Winter Solstice) - the sun's longitude is 270 degrees; this term must fall in the 11th month
 Principal Term 12 - the sun's longitude is 300 degrees

60-year cycle


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last edited Saturday, March 29, 2008