The daily and monthly branches must be checked from the perpetual calendar, and the monthly branch also decides that "Jiaxu Year, C as the beginning, B Geng Year, E as the head, C Xin Year and G as the head." For example, this year, Ding Ren and Ren Yinshun went first, the first month was Ren, and February was Guimao, all the way down. For your reference.