Ten Heavenly Stems and Twelve Earthly Branches MatchThe ten heavenly stems are A, B, C, D, Wu, Ji, Geng, Xin, Ren and Gui; The twelve earthly branches are Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai. The ten stems and twelve branches were matched in order to form sixty basic units, forming the stem and branch epoch method. The matching situation was as follows:
Jiazi, Yichou, Bingyin, Dingmao, Wuchen, Jisi, Gengwu, Xinwei, Renshen and Guiyou;
Jiaxu, Yihai, Bingzi, Dingchou, Wuyin, Jimao, Gengchen, Xinsi, Renwu and Guiwei;
Jiashen, Yiyou, Bingxu, Dinghai, Wuzi, Jichou, Gengyin, Xinmao, Imjin and Guisi;
Jiawu, Yiwei, Bingshen, Dingyou, Wuxu, Jihai, Gengzi, Xinchou, Renyin and Guimao;
Jiachen, Yisi, Bingwu, Dingwei, Wushen, Jiyou, Gengxu, Xinhai, Renzi and Guichou;
Jiayin, Yimao, Bingchen, Dingsi, Wuwu, Jiwei, Gengshen, Xinyou, Renxu and Guihai.