60-A subsequence diagram

"Sixty Jia Zi", also known as "Sixty Jia Zi", was used in ancient China for calendar year, calendar month, calendar day and duration. Sixty Jiazi consists of ten heavenly stems and twelve earthly branches, namely, Jiazi, Renchou, Bingyin, Ding Mao, Chen Wu, etc. It ends with Guihai, then begins with Jiazi, and goes on and on. See the figure below for details:

I. heavenly stems and earthly branches

"Sixty Jiazi" is based on "heavenly stems" and "earthly branches", which are symbols of ancient China. "Heavenly stems" include "A, B, C, D, E, Ji, G, Xin, Ren and Gui". "Ground branch" includes "Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai".

Second, the chronology of cadres and branches

In the year of the main branch, each branch represents one year, and sixty years is a cycle. The initial branch is called "Jiazi", so it is called "Sixty Jiazi"; Because the names of cadres and branches are complicated, they are also called "sixty flowers". Therefore, it is customary for later generations to call those who are 60 years old "flower armour" and those who are over 60 years old "flower armour old man".

Sixty Flowers can be used in chronology, and sixty years is a cycle when it is used in chronology. As shown in the figure below, the latest Jiazi year in the past was 1984, and the branches of that year can be calculated according to Jiazi year 1984. For example, 20 17 years is Ding You.