How to calculate leap month? What are the rules?

Leap moon is calculated according to the time when the earth moves around the sun. The time for the earth to go around the sun is 365 days, 52 hours, 48 minutes and 48 seconds, and the year set by the yellow calendar is 365 days. If 365 days are removed, the remaining time accumulates into one month, which is called halo accumulation and leap month. Will be shown in this lunar calendar. In addition, there are 366 days in leap year. If the full moon of this month is removed, the remaining time will be accumulated into one day, which is called leap year.

Leap moon law: The earth revolves around the sun once, and the number of months in a year cannot be odd zero, so there are only 354 days in a year 12 months. Compared with the actual year, it is about 1 1 day, which adds up to three years and 33 days. So there must be a leap month every three years, with three or four days left, which adds up to two years.

Leap year and leap month

There are leap years and leap months in the lunar calendar, but generally speaking, many people will confuse leap years and leap months. Although there is only one word missing, the meaning is really different. We can easily understand leap years. In general, it is: "leap once every four years, not for a hundred years, and leap again every four hundred years", but leap month is not like this at all.

To understand leap month first, you should know that there are 24 solar terms, which are divided into solar terms and neutral atmosphere in a year. There are leap months because the neutral atmosphere of 12 should be controlled within each month, because each neutral term must fall within the specified month. If a month is almost over and the neutral atmosphere hasn't arrived yet, you need to wait another month, which is the reason for leap month.