Answer:
There are many theories about the origin of the Spring Festival, among which several are more representative, such as the Spring Festival originated from the wax festival, the Spring Festival originated from the witchcraft ceremony, the Spring Festival originated from the Ghost Festival, etc., but the generally accepted theory is that the Spring Festival rose from the period of Yu Shun.
One day in the year 2000 BC, Shun, the son of Heaven, led his subordinates to worship heaven and earth. Since then, people regard this day as the beginning of the year. This is said to be the origin of the Lunar New Year, later called the Spring Festival;
Two, ancient: the date of the Spring Festival of China is not consistent: the Xia Dynasty with the January month of the spring for the first month, the Shang Dynasty with the twelfth month (December) for the first month, Qin Shihuang unified the six countries after the provisions of October for the first month, the early Han Dynasty to follow the Qin calendar. In 104 B.C., in the first year of the reign of Emperor Wudi of Han Dynasty, astronomers Luo Hong, Deng Ping and others formulated the Tai Chu Calendar, which changed the beginning of the year from October to the beginning of the year in the first month of Meng Chun, and later people gradually improved it into the lunar calendar we use today. Luo Hong was also known as "the Old Man of the Spring Festival". Since then, China has been using the Xia calendar (lunar calendar, also known as the lunar calendar) to record the year until the Qing Dynasty, as long as 2080 years;
Third, the Lunar New Year officially named the Spring Festival, is after the revolution of 1911; Because at that time to change to the solar calendar, in order to distinguish between the two sections of agriculture and Yang, so the first lunar month had to be renamed "Spring Festival".