How to calculate the lunar leap month? In what year does a leap year occur?

The month of adding leap month is inferred by the rules of the lunar calendar, which is mainly determined according to the coincidence degree with the 24 solar terms of the lunar calendar. In the year with leap month, there are 13 months, and the calendar year is 383 to 385 days. This year is also called leap year.

For example, in the lunar calendar 1984, there are two October, which are usually called the first October and the last October (that is, leap month). Lunar leap year leap month calculation, three-year leap, five-year leap, 19 leap; The lunar calendar basically takes 19 as a cycle, corresponding to the same time in the Gregorian calendar. For example, in the Gregorian calendar, May 27th, 200 1, May 27th 1982 and May 27th 1963 are the fifth day of leap April.

Extended data:

Super-long lunar year

The longest lunar leap year can be as long as 385 days, which is very rare. From 22 BC1year to 2 AD120 year, there were only 9 times. From 1900 to 4000, it appeared 22 times in 2 100, and the years of its appearance were:

1925, 1944, 2006, 2270, 2289, 235 1, 2606, 2625, 2634, 2889, 295 1, 2970.

In normal years, the extremely short lunar year has only 353 days. From the first year of A.D. to 5000 A.D., only the following nine years have 353 days:

780, 1620, 1965, 2372, 3620, 3903, 3965, 4 186, 4248.

Baidu encyclopedia-leap year