What is the formula for calculating the lunar sun column?

Fast calculation of solar column stem-branch method

New Year's Day in 2000 is Wuwu Day. If you want to get daily income, you can refer to this day. That is to say, the total number of days between Wish Day and New Year's Day in 2000 is calculated, assuming that the total number of days is A. ..

Then the calculation method of daily expenditure for the day after 2000 is as follows: (A-5)÷ 10, and the remainder 0-9 is daily expenditure; (A-7)÷ 12, take the remainder 0- 1 1 as the daily branch; (A-5)÷ 12, take the remainder 0- 1 1 as the daily branch.

The calculation method of daily branch before 2000 is as follows: (A+5)÷ 10, and then subtract the remainder 0-9 from 10 to get the daily branch; (A+5)÷ 12, and then subtract the remainder 0- 1 1 from 12 to get the daily branch.

Sunbeads represent the day when they were born.

The daily records of the trunk and branches are circulated every 60 days. Due to the different months and leap years, it is necessary to find a perpetual calendar for the trunks and branches every day.

The sun column, in the words of life science, starts from midnight to midnight clockwise, with twelve hours as a day, and each hour takes up two hours. The dividing line between day and day is midnight, that is, eleven o'clock at night. Before eleven o'clock is the last day of Shihai, and after eleven o'clock is the next day. Please pay special attention to this point, and don't think that midnight is the dividing point of the day.

Reference to the above content: Baidu Encyclopedia-Rizhu