THE CHINESE CALENDAR, ONE OF THE OLDEST IN THE WORLD The Chinese calendar is a sun-and-moon calendar: months are set according to the moon, i.e. the first day of each month is the new moon and the 15th day is the full moon. Because the solar year counts 12 lunar month plus a dozen of days, seven intercalary months are added over each 19 years, in order for the calendar year to stay within a solar year. According to traditions, the first calendar system (sexagenarian cycle) was created by the Yellow Emperor, in 2637 BC. The Gregorian calendar was officially adopted by the PRC in 1912, then extended to the whole state in 1929.
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