For the 3,000 years leading up to 1912, Chinese life was ordered solely according to the lunar calendar.

    In ancient times, agriculture was the economic mainstay of China and its people, and the purpose of establishing a calendar was to regulate agricultural production. Chinese ancients discovered, through astronomical observation, that during the earth's 12-month orbit around the sun, its changing position gave rise to periodical changes in climate and thus distinctive farming seasons. They subsequently designated 24 positions within the earth's orbit, calling them the 24 Jieqi (24 solar terms).