What are the 12th and 24th branches respectively?

Heavenly stems and earthly branches is short for "dry branch".

Heavenly stems and earthly branches is equivalent to tree trunks and leaves. They are an interdependent and coordinated whole. In ancient China, heaven was the "master" and the earth was the "slave". The interconnection between "heaven" and "dryness" is called "heavenly dryness"; The relationship between "earth" and "branch" is called "earth branch", which together is "heavenly stems and earthly branches".

There are ten characters in Tiangan, and the order is A, B, C, D, E, F, G, Xin, N and D, which are collectively called "Ten Tiangan".

There are twelve characters in the earthly branches, the order of which is Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai, which are collectively called "Twelve Earthly Branches".

The original meaning of heavenly stems and earthly branches, there is an interesting saying: