But no matter which way, we must first understand the two parameters that make up the birth, one is the heavenly stem and the other is the earthly branch.
There are ten heavenly stems, 1 A, 2 B, 3 C, 4 D, 5 E, 6 F, 7 G, 8 F, 9 N,10 d.
12 earthly branch, 1, 2 ugly, 3 ugly, 4 ugly, 5 ugly, 6 ugly, 7 noon, 8 unfinished, 10 unitary, 1 ugly, 12 hai.
Among the twelve branches of ten-day trunk, the odd number is Yang and the even number is Yin.
Heavenly stems and earthly branches is consistent, Yang matches Yang, Yin matches Yin. Yin and he don't match. For example, Jiazi is double yang, and Yihai is double yin. There is no such thing as yin and yang collocation.
Because the heavenly stems are less than the earthly branches, there are always two earthy branches thrown out when matching. For example, Jia Zi, Yi Chou, Bing Yin, Ding Mao, Chen Wu, Keith, Geng Wu, Xin Wei, Ren Shen, Gui You and Xu Hai. The next round is Tiangan, JOE and Yihai.
By analogy, the first round Jiazi is the head, the second round JOE is the head, the third round Shen Jia is the head, the fourth round Wu Jia is the head, the fifth round Chen Jia is the head, and the sixth round Jiayin is the head.
In the seventh round, it's Jiazi's turn again. So every six rounds, every ten years, every sixty years.
There are four pairs of heavenly stems and earthly branches at birth.