When did the lunar calendar in China originate?

Probably originated in Shang Dynasty, the lunar calendar belongs to the lunar calendar, and the length of a month depends on the phase of the moon. At the same time, set 24 solar terms to determine the annual change. The origin of the Spring Festival is not so early, and the agreement to take the first day of the first month as the New Year began with Emperor Wu of the Han Dynasty. Before that, the New Year was not the first day of the first month.

In Xia Dynasty, January was the first month in Meng Chun, and in Shang Dynasty, December was the first month. After Qin Shihuang unified the six countries, October was the first month, and the Qin calendar was used in the early Han Dynasty. In BC 104, astronomers Luo and others made a calendar, which changed the beginning of October to the beginning of the first month, and later generations basically improved it to the lunar calendar that we use today. Luo is also known as the "Spring Festival Old Man". Since then, China has been using the Gregorian calendar (also known as the lunar calendar) until the end of the Qing Dynasty, which lasted for 2080. Spring Festival has different names in different times.