When did the five elements in the eight characters start to be divided?

Take the time of beginning of spring in the lunar calendar (note that it is not 0: 00 on beginning of spring Day) as the starting point of the annual main branch; The starting point of each month is twelve knots (note that it is not necessarily 0: 00 on Boxing Day); For example, on February 4th, 20 10, 6: 48 is beginning of spring time; before 6: 48 on February 4th, it belongs to the ugly month of last year (official calendar); after 6: 48 on February 4th, it belongs to silver moon of next year.

China Moon Network Information:

The most fundamental part of the lunar calendar consists of two parts, namely, the lunar calendar and solar terms, and other parts are derived from these two parts. It mainly includes the following parts:

First, the calendar part of the lunar calendar (including the trunk and branch of the calendar, which is different from the trunk and branch calendar mentioned later);

Second, solar terms and seventy-two periods;

Third, miscellaneous solar terms;

Fourth, the official calendar [The zodiac calendar in the China lunar calendar (December, that is, the zodiac in China) is a part of the lunar calendar, which was developed according to the idea of the Twelve Qi Calendars written by Shen Kuo in the Song Dynasty.

Note: The lunar month corresponds to the degree of the Yellow Meridian of the Twelve Qi Sun.

The algorithm of the calendar in the lunar calendar is as follows: the starting point of the annual calendar is the time of beginning of spring in the lunar calendar (note that it is not the zero point of beginning of spring day); The starting point of each month is twelve knots (note that it is not necessarily 0: 00 on Boxing Day); Adopt a long-term uninterrupted calendar method (China has used it for thousands of years); The time is fixed at 12, and the time comes from the same day.

Because the solar terms of the lunar calendar use fixed qi, it corresponds to meridian 0 degrees from the vernal equinox, and from then on each solar term is 15 degrees, and the solar terms of the ecliptic are 360 degrees.