Lunar calendar is the current traditional calendar in China, which belongs to the combined calendar of yin and yang, that is, the combined calendar of lunar calendar and solar calendar. According to the change cycle of the moon phase, each moon phase changes to one month, and the reference year of the sun is the length of one year, plus 24 solar terms, so that the average calendar year adapts to the tropic year. The lunar calendar combines the lunar calendar with the solar calendar to form a method of combining yin and yang, which was called Xia Zheng in ancient times.

According to the national standard "Compilation and Promulgation of the Lunar Calendar" drafted by Purple Mountain Observatory of China Academy of Sciences, the first day of the lunar month is the first day of the lunar month, which means that the first day of each lunar month must be the first day of the lunar month, and each lunar month reflects a complete cycle of moon phase change, so it belongs to the lunar calendar in the lunar calendar, and the 24 solar terms of the lunar calendar reflect the different positions of the earth's orbit around the sun, that is, the tropic year cycle, so it belongs to the solar calendar in the lunar calendar.

Historical origin

From the era of ancient cadres and branches to the opening of the solar calendar in the late Qing Dynasty, it was revised many times in history. In the history of China, more than 65,438+002 calendars have been produced, which have had a great influence on the culture and civilization of China, such as the official calendar (photo), the Xia calendar, the Shang calendar (lunar calendar), the Zhou calendar, the taichu calendar calendar in the Western Han Dynasty, the San Tong calendar and the imperial calendar in the Sui Dynasty.

The ancients observed the movement law of astronomical phenomena. In ancient times, the era of stems and branches was adopted. According to Wan Mingying, a historian of Ming Dynasty, it was invented when the stems and branches were identified as royalty according to the clear records in the ancient documents of China. It is recorded in detail in his book "Three Commandments". The invention of tree trunks and branches marked the emergence of the most primitive calendar and was used to calculate the age by numbers.