Heavenly stems and earthly branches of the zodiac: a mouse; Ugly cow; Yin Hu; Hairy rabbit; Chen Long; Snakes; Afternoon horse; Sheep; Shen monkey; Chicken; Dogs; Sea pig

Heavenly stems and earthly branches, referred to as the "main branch" for short, originated from the observation of astronomical phenomena in Archaean China. "A, B, C, D, E, B, G, A, B, C, B" is called ten-day work;

"Zi, Ugliness, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai" are collectively called twelve branches.