How often do you jump into September?

There is no fixed number of years in leap September.

The following are the years of leap September: 1737 (Ding Sinian), 1756 (Bing Zinian), 1832 (non-Chen Nian), 20 14 (Wu Jianian) and 21.

Leaping September means that there are two September in a year, and the last September is called "Leaping September". Before and after 2 1 century, leap months were rare in September, and there were no leap months in the 20th, 24th, 25th and 27th centuries (but the frequency of leap months gradually increased with time).

Extended data:

Leap moon law:

1, the earth goes around the sun once, that is, the moon goes around the earth once, twelve and a third times. The number of months in a year cannot be odd, so there are twelve months in a year, totaling 354 days. Compared with the real year, it is about 1 1 day, and it has accumulated to three years and 33 days. So we must set up a leap month every three years, with three or four days left, and then two years, with a total of 25 or 26 days left, we can set up a leap month.

2, the average calculation, every 19 years must be 7 leap. Leap month is a month without festivals, leap year is a leap year, and leap year has thirteen months. A month is a leap month, and the name of the month depends on the name of the previous month. For example, the previous month is August and the leap month is leap August. The average year is twelve months. The lunar calendar has 12 months in a normal year, 354 or 355 days in a year, 13 months in a leap year and 383 or 384 days in a leap year.

Baidu encyclopedia-leap in September