The ancestors of the Chinese observed the sunrise and sunset and the phases of the moon, and they set up a well-rounded almanac for later generations. It has been continuously in use for more than 2000 years.
中國祖先們觀察日出日沒、月亮圓缺，為後世子孫立下了完善的曆法，至今二千餘年延續不輟。