According to the records of ancient books in China, the "chronology of branches and stems" was originally used in ancient Central Plains, that is, 10 heavenly stems symbols A, B, C, D, E, G, Xin, Ren, Gui He 12 earthly branches symbols Zi, Ugly, Yin, Mao, Chen, Si, Wu and Wei.
In the chronology of cadres and party branches, the beginning of the year is the dividing line between the old and new years.
The beginning of a year is the first day of the new year. The first month of Xia dynasty is the first year, the twelfth month of Shang dynasty (1February) is the first year, the winter month of Zhou dynasty (1 1 month) and the October of Qin dynasty. BC 104, Emperor Wu of the Western Han Dynasty issued a letter to promote taichu calendar, stipulating that the first day of the first month of the first month was the beginning of a year. Since the Han dynasty, successive dynasties have followed. Although the calendars of each generation have been revised and changed, the beginning of a year is always determined as the first day of the first month of the summer calendar.
Therefore, it is indisputable that the beginning of a year is the first day of the first month, and it is an inherent tradition to divide the zodiac according to the first day of the first month.