In what year does leap month occur?

The appearance of leap June is irregular.

Leap June usually occurs once every 19 years (such as 1960 and 1979), and sometimes once every 38 years (such as 1835 and 1873).

Other occurrences are more than 19 years but not more than 38 years (such as 1987, 20 17 years, separated by 30 years, 28 10 years and 2837 years), with a minimum interval of 8 years (such as 20 17 years and 2837 years).

Extended data

The function of leap month is the month solved by setting leap month in ancient times. If the twenty-four solar terms are divided into solar terms and neutral atmosphere, the month without neutral atmosphere is defined as "leap month" by the calendar and called "leap month".

There were 24 solar terms in the ancient calendar, which were divided into solar terms and neutral atmosphere. The lunar calendar is angry twice a month. The beginning of the month is called solar terms, and after the middle of the month is called qi. "For example, beginning of spring is the first month's solar term, and rain is the first month's gas." ?

The average length of the two solar terms in Gregorian calendar is 30.5 days, while that in Lunar calendar is only 29.5 days, with a difference of 1 day. So the monthly weather will be 1-2 days later than last month. If this goes on, there will always be a month when there is only solar terms and no gas. In a year, the distance between the earth and the sun is near and far.

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