How is the chronology of cadres and branches calculated?

Heavenly stems = (Gregorian calendar year)/10, resulting in a remainder.

Ground branch = (Gregorian calendar year)/12, resulting in a remainder.

Examples of specific algorithms:

1, found in the perpetual calendar that 1995 is the year of Yahai.

Calculation: Look up the table first. If 1995 with mantissa of 5 knows that the heavenly stems are B, divide the year (1995) by the remainder of 12 to know that the earthly branches are Hai, then 1995 is the year of B Hai.

2. For example, 20 13, the last year is checked in the calendar.

Calculation: Look up the table first, the mantissa is 20 13, then divide the year (20 13) by 12, and the remainder is 9, and 9 is 4. Then 20 13 will be the last year.

The meaning of trunk and branch

Husband is still dry, strong and yang; The wood branch is weak in yin. In the past, Pangu's understanding of heaven and earth turned Yin and Yang into three talents. After the first emperor divided heaven and earth into two parts, there was heaven first, and then there was land, because gasification led a miserable life. Therefore, after Pangu's rule, the emperor's surname was thirteen, saying that he was indifferent to nature, doing nothing and vulgarizing himself, in the name of doing things, in order to determine the year. Its ten dry characters are "Welcome, Boundless, Gentle, Strong, Harmonious, Earthy, Zhang Shang, Shiguang, Mystery and Zhaoyang".

Twelve branches: Quinton, Chi Fenruo, She Tige,,, Luo,, Qi Tan, Zuo Meng, and Da Yuanxian. In ancient times, the ancients took heavenly stems and earthly branches as the carrier.

Reference to the above content: Baidu Encyclopedia-heavenly stems and earthly branches