Calculation method of leap month

The formula for calculating leap months is: 19 years as a cycle, plus 7 months. There is no leap in three years, and both sides leap in three years. There will be no leap month in the next two years, and this cycle will last for another eight years. The past three years have not been a leap. Next week I will look forward to the next year.

Leaping moon is a way of calendar leap. In Asia (especially in China), leap month refers to the month that increases every two to three years in the lunar calendar. In order to coordinate the contradiction between the tropic year and the lunar year and prevent the lunar year from being out of touch with the tropic year, that is, the four seasons, 1 leap is set every 2~3 years.

The current lunar calendar method is "seven leaps in nineteen years", that is, every two to three years, a lunar month that is the same as the previous month must be added, and the added month is called a leap month.