When is the first day of the first month of the Spring Festival? Why is it called ternary?

1. After the Revolution of 1911, the Gregorian calendar was gradually changed. Later, in order to distinguish between the two New Years, January 1st in the summer calendar was just before and after the solar term "beginning of spring", and the solar term "beginning of spring" was one of the 24 solar terms in the official calendar, so January 1st in the summer calendar was renamed as "Spring Festival" and January 1st in the solar calendar as "New Year's Day".

2. The first day of the first month is the yuan of one year, one month and one day in the lunar calendar, so it is called "three yuan"; Because this day is still the old dynasty, the moon dynasty and the Japanese dynasty, it is also called the "three dynasties"; Because it is the first Shuori, it is also called "Yuanshuo". On the first day of the first month, there are other nicknames such as Shangri-La, Zheng Chao, Sanshuo and Shisan, meaning that the first day of the first month is the beginning of the year, month and day.