Fast calculation method of trunk and branch

First of all, you must be able to remember ten days and twelve branches. Ten days of work are: A, B, C, D, E, G, Xin, Ren and Gui. Twelve earthly branches: Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai;

Heavenly stems and earthly branches's method of chronology is that the heavenly stem is in the front and the earthly branch is in the back. For example, in 2005, this year is the year of-yiyou. Let's count the days first. There is a formula:

4, 5, 6, 7, 8, 9, 0, 1, 2, 3, the corresponding ten days are

Party A, Party B, Party C, Party D, Party E, Party B, Party G, Party A, Party B, Party B, Party C, Party B, Party B, Party B, Party B,

The number is the last digit of the year, for example, this year is 2005, the last digit is 5, and the corresponding heavenly stems are B;

Earthbranch algorithm: divide the number of years by 12, and the remainder after that represents a earthbranch, and the remainders are: 4, 5, 6, 7, 8, 9, 10, 1 0 (divisible) and/kloc-0 respectively. Take 2005 as an example: the year-end is 5, and the corresponding heavenly stems are B. When 2005 is divided by 12, the remainder is 1, and the corresponding earthly branches are unitary, then 2005 is B year.