How many are there in heavenly stems and earthly branches?

Calendars use heavenly stems and earthly branches to arrange year numbers and dates. There are ten words in Tiangan, so it is also called "Ten Dry". The order of arrangement is: A, B, C, D, E, Ji, G, Xin, Man and Ghost; There are twelve characters in the earthly branch, which are arranged in the following order: Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai. Among them, A, C, E, G and N are yang dryness, while B, D, J, Xin and Gui are yin dryness. Zi, Yin, Chen, Wu, Shen and Xu are the Yang branches, while Ugliness, Mao, Si, Wei, You and Hai are the Yin branches.

Dominate a stem with land, arrange them, with the heavenly stem in front, the earthly branch behind, the heavenly stem starting from the nail, the earthly branch starting from the child, the yang stem against the yang branch, and the yin stem against the yin branch (the yang stem against the yin branch and the yin stem against the yang branch), and get a cycle of 60 years. It is called "Sixty Jiazi" or "Flower Jiazi". In the past, China people used to mark the year, month, day and time with a cycle of 60 years.

Heavenly stems and earthly branches's 22 symbols are intricate and orderly, full of harmony and laws. It shows the law of natural operation, the interaction of real-time (time) space (orientation) and the result of interaction of Yin and Yang. China calendar contains the thought of Yin-Yang and Five Elements and the law of natural circulation.

Year: one year for each branch, after 60 branches, start from the beginning and repeat. Starting from Jiazi, it is called Jiazi or Huahua Jiazi 60 years later. It's called the chronology of cadres and branches.