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In page Lunisolar calendar:

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The Chinese calendar (華夏曆法) or Chinese lunisolar calendar is also called Agricultural Calendar [農曆; 农历; Nónglì; 'farming calendar'], or Yin Calendar [陰曆; 阴历; Yīnlì; 'yin calendar']), as movements of the sun (representing Yang) and moon (representing Yin) are the references for the Chinese lunisolar calendar calculations.[citation needed] The Chinese lunisolar calendar is the origin of some variant calendars adopted by other neighboring countries, such as Vietnam and Korea.