How to calculate Geng ri

The monthly calculation method of Geng Day is: one Geng Day every ten days.

Gengri refers to the time recorded by ancient heavenly stems and earthly branches in China. Tiangan 65,438+00, namely A, B, C, D, E, G, Xin, Ren and Gui. The earthly branches are used to indicate the order of year, month and time, and there are 12 numbers * * to record the earthly branches, namely, Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai.