Ask a question about heavenly stems and earthly branches's Moon Column Algorithm. I am the birthday of the first day of the eighth lunar month. Why is the moon column heavy?

The earthly branches of the month are not divided by date, but by solar terms. 1981August 29th is the first day of the eighth lunar month. However, the Millennium came late that year and will not end until September 8 (August 11 of the lunar calendar). Therefore, it can only be calculated according to the monthly construction "Shen" in July, but not according to the monthly construction "You" in August. If you don't believe me, you can check the monthly construction in the days after August 11 of the lunar calendar, all of which are "Ding You" instead of "Bing Shen". Brother, you should make clear the definition and usage of "Five Tigers". Don't think that 12 branch coincides with1February. Anyway, the earthly branch is fixed every month, the first month is always cloudy, and August is always unitary. The biggest advantage of using solar terms instead of dates is that it saves the trouble of lunar leap month. Give some convenience to those fortune tellers. But it is not easy to quickly calculate the date of each solar term (accurate to 2 hours). In the era without computers, it is not easy to do fortune telling! I don't believe in eight characters myself. But when I get old, I always like to study how they are.