How many years is the leap September

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The time of the leap September is not fixed.In 1832 it was the leap September, in 2014 it was the leap September, and in 2109 it was the leap September.We can see that there is no intercalary month.Regularly, because the time of each intercalary month is not fixed at an interval of two to three years.

Meaning of the leap month

The leap month is a way of setting the leap month in the calendar.In Asia (especially in China), a leap month refers specifically to a month added to the lunar calendar every 2 to 3 years.In order to coordinate the contradiction between the return year and the lunar year, and prevent the lunar year and the return year from being out of touch with the four seasons, an intercalary is set every 2 to 3 years.In ancient times, the intercalary week with 7 intercalary years was adopted in 19 years, and the fixed intercalary week was abolished in the "Linde Calendar" of the Tang Dynasty, and the intercalary month was used to set the intercalary week, so it was the intercalary time.

The lunar calendar is my country’s traditional calendar, and the traditional lunar calendar adopted is a calendar based on the lunar calendar and at the same time integrating the elements of the solar calendar, that is, the yin-yang calendar.The lunar calendar is based on the changes of the moon’s yin, yang, and yin, and the date and month are determined according to the phase of the moon.A lunar lunar lunar month is 29.5306 days on average, and 12 lunar lunar months are 354 or 355 days, which is about 11 days away from a solar lunar year (about 365.25 days), and the cumulative time gap over 3 years will exceed one month.In order to coordinate the number of days between the lunar year and the solar year, the lunar calendar is adjusted by the "intercalation method" to make the total number of days in the two years compatible.

Calculation method of leap month

The middle month of the lunar year is based on the length of the synodic month of 29.5306 days, so the big month is 30 days and the small month is 29 days.In order to ensure that the first day of each month (the first day of the new year) must be the new day, the arrangement of the big and small months is not fixed, but it needs to be determined through strict observation and calculation.Therefore, it is common for two consecutive months in the lunar calendar to be the big month or the small month, and even in 1990, March and April were small months, and September, October, November, and twelfth were four consecutive months.A rare exception to Otsuki.

How long does it take to add a leap month? The best way is to find the least common multiple of the number of days in the tropical year and the number of days in the synodic month:we hope that the number of days in m tropical years is equal to the number of days in n lunar months, which is the equation:m × 365.2422=n × 29.5306.

How many years does the leap September appear once

1737 (Dingsi year), 1756 (Bingzi year), 1832 (Renchen year)

2014 (Jiawu Year), 2109 (Ji Si Year), 2204 (Jiachen Year)

2223 (Guihai Year), 2576 (Bingchen Year), 2720 (Gengchen Year) Year)

2739 (Jihai Year), 2815 (Yimao Year), 2834 (Jiaxu Year)

2853 (Guisi Year), 2929 (Jiyou Year) )

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