When did beginning of spring introduce the information about beginning of spring?

1, beginning of spring time is not fixed every year. Beginning of spring in 2020 is on February 4th, 2020. Beginning of spring on 202 1 is February 3rd.

2. The solar terms in beginning of spring are calculated according to the law of constant air in the dry calendar. According to accurate astronomical calculation, the solar terms in beginning of spring reach longitude 3 15 degrees. The trunk calendar is divided into twelve months and twenty-four solar terms, each month contains two solar terms, and there is no leap month.

3. The calendar of branches and branches is related to the periodic motion of the earth around the sun, and its year, month and day are determined by the apparent motion of the sun, regardless of the moon phase. Also different from the usual solar calendar (such as the Gregorian calendar), the length of the Gregorian calendar is artificially specified and has nothing to do with the astronomical phenomena.

4. The year, month and day of the calendar are determined by the astronomical phenomena, so there is no need for artificial adjustment, so the solar terms of the calendar completely conform to the astronomical laws (the running position of celestial bodies). After the twenty-four solar terms of the dry calendar are finished once, it is a year of return.