How to track the moon?

In the lunar calendar, each earthly branch corresponds to 24 solar terms from one solar term to the next, and the starting period of a month is determined by the festival time, not from the first day to the end of a month in the lunar calendar. In case of the year of A or B, the first month is roughly C Yin; B or Geng Year, the first month is roughly Wuyin; The first month of year C or Xin is roughly Geng Yin, the first month of Ding Nian or Ren Year is roughly Ren Yin, and the first month of year E or decyl is roughly Jia Yin. The first month is calculated according to the main branch, and other months are calculated according to the main branch. A cycle of 60 months and 5 years; Reuse after a cycle, cycle after cycle, cycle. The 60th day of a year is roughly a cycle of two months; Reuse after a cycle, cycle after cycle, cycle. Compared with recording a month and a day, it is very easy to calculate the date interval of historical events and whether there is a leap month. Because the 29th or 30th day of each lunar month is uncertain, and whether there is a leap month is unknown, it will be very difficult to calculate if the date crosses the month. As for the correspondence between a certain day and the main branch, you can check the perpetual calendar.