How to calculate the chronology of heavenly stems and earthly branches, for example, 19 1 1 is the year of Xinhai, how to calculate it?

Annual dry formula: annual dry = annual single digit -3 (applicable to any year, single digit is less than or equal to 3, borrow 10).

Annual branch formula: annual branch = (year +7) ÷ remainder 12 (divisible by remainder 0, that is, remainder 12= ugly).

Heavenly stems and earthly branches: "A, B, C, D, E, Ji, G, Xin, Ren, Gui" are called ten heavenly stems, and "Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai" are called twelve earthly branches.

For example, 19 1 1 year is: 1 1-3=8 is symplectic. The annual branch of 19 1 1 is: (1911+7) ÷12, and the remainder is 10, which is the sea.

Extended data:

The history of heavenly stems and earthly branches can be traced back to Shang Dynasty, when ten characters, such as A, B, C and D, appeared to calculate and record numbers, which were called heavenly stems, and were combined with earthly branches (such as Jia Zi and E Yuan) to determine the year, month, day and time.

From the discovery of Oracle Bone Inscriptions in Shang Dynasty, more than 99% of the contents are related to divination, which is what we often call "Oracle Bone Inscriptions", but Oracle Bone Inscriptions is not the whole content of Oracle Bone Inscriptions. In addition, there are a few but very important other kinds of inscriptions that have nothing to do with divination. For example, the inscription "List of Branches and Branches" in it. The inscription of "the surface of the liver" is a special inscription in Oracle Bone Inscriptions, belonging to the epigraph inscription.

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