Calculation method of leap month

The calculation formula of leap month is: 19 years, plus 7 months. Three years without leap, three years on both sides leap. There will be no leap month in two years, and this cycle will continue for another eight years. The last three years have not been a leap, and we look forward to the next year next week.

Leaping month is a way of calendar leap. In Asia (especially China), leap month refers to the month that is added 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 method of setting leap in lunar calendar is "19 years and seven leap years", that is, every two to three years, a lunar month that is the same as the previous month is added, and the added month is called leap month.