How often do you leap into September?

There is no fixed number of years when there is a leap in September.

The following are the years of leap September: 1737 (the year of Ding Si), 1756 (the year of Bing Zi), 1832 (the year of Ren Chen), 214 (the year of Jiawu), 219 (the year of Ji Si) and 224 (the year of Jia Chen).

leap September means that there are two September in a certain year, and the latter September is called "leap September". Before and after the 21st century, leap months were relatively rare in September, and there were no leap months in the 2th, 24th, 25th and 27th centuries (but the frequency of leap months gradually increased with time).

Extended information:

The regularity of leap months:

1. The earth revolves around the sun once, that is, the moon revolves around the earth twelve times and one third. The number of months in a year cannot be odd, so there are twelve months in a year, one ***354 days, which is about 11 days compared with the real year, and it accumulates to three years and 33 days. Therefore, a leap month must be set up every three years, and if there are three or four days left, it will be accumulated for two years, and if there are twenty-five or twenty-six days left, a leap month can be set up.

2. On average, there must be seven leaps every nineteen years. A leap month is a festival-free month, a leap year is a leap year, and there are thirteen months in a leap year. One 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 twelve months in a normal year, one ***354 days or 355 days in a year, thirteen months in a leap year and one ***383 days or 384 days in a leap year.

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