T.Jonchev написа
The earliest archaeological evidence of the Chinese calendar appears on oracle bones of the late second millennium BC Shang dynasty. They show a 12-month lunisolar year having an occasional thirteenth month, and even a fourteenth month. Adding extra months to a calendar year is known as interaction, and keeps the new year from drifting backwards through the seasons, just as the Gregorian Calendar puts an extra day in February every four years.
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