First, the calculation formula of the daily branch of the lunar calendar:
Remember the divination of the moon and the moon,
It is a stalk that establishes the root cause.
The trunk is in the same place,
Take a day off after a small job.
25 years 1 month 13,
One branch is the same as the other.
Calculation method: "The big and small moon hexagrams are remembered in the heart, which is the fundamental reason." The big moon in the lunar calendar is 30 days and the small moon is 29 days, which is fixed. If you want to calculate the number of branches and branches of the lunar calendar, you must first compile the predicted year with two hexagrams according to the formula of the lunar calendar, so as to calculate the number of branches and branches in a day. In addition, you should also remember the branches and branches on the first day of the first lunar month, because this is the basis of daily calculation in a year. "After the big trunk, I rushed in the same place, and after the small trunk, I retired for one day." The heavenly stems and earthly branches of the lunar calendar is combined, and the sky is dry for 2.5 times. According to this law, the first day of a month is the main branch. If this month is a miscarriage, it should be in the case of the same branch, and the main branch should be reduced by one, which is the first day of the next month after the miscarriage. For example, on the first day of this month, the main branch is your own, this month is a big month, and on the first day of next month, the main branch is your own. If this month is a miscarriage, then the first day of next month should be decided after a person retires, that is, Wushen Day. "On the first day, 13 and 25th, the same branch counts as one." After determining the first day of a month, these two sentences divide the month into three stages, that is, from the first day to the twelfth day, from the thirteenth day to the twenty-fourth day. The first, thirteenth and twenty-fifth days of junior high school are also regular in terms of cadres and branch offices. On the first day of knowing the trunk, you only need to push the trunk once every other day, but the branches remain the same. Similarly, 13 knows the main branch, and 25 knows the main branch. If the first day is Jiazi, thirteen is Bingzi and twenty-five is Wuzi. If you master this method, you can quickly know what day it is according to which section it belongs to.