Haishi Hainuo wishes you a happy Mid Autumn Festival and National Day!

Why is the national day and the Mid Autumn Festival on the same day in 2020?

Astronomical experts said that the Mid Autumn Festival is a normal calendar phenomenon. It was last seen on October 3, 2009 (leap may). The next “Reunion” of the Mid Autumn Festival and national day will be on October 1, 2020 (leap April). Yes, you are right. The national day and the Mid Autumn Festival are on the same day! If there is another Mid Autumn Festival on October 4, you have to wait until 2036 (leap June).

Zhao Zhiheng, director of the Tianjin astronomical society, said that according to the Chinese lunar calendar, there are 354 or 355 days in the 12 months of – year, which is about 11 days less than the number of days in a regression year, and more than one month less in four years. After a long time, there will be a strange phenomenon of disorder of time sequence and time. In order to solve this problem, we adopt the method of adding “leap month”. The appearance of the leap month not only delayed the Qixi Festival, but also the Mid Autumn Festival. In addition, the Mid Autumn Festival of the lunar calendar generally appears between September 7 and October 6 of the Gregorian calendar, which makes the Mid Autumn Festival meet the national day. If the leap month of the lunar calendar is added before August, most of it will cause” happy meeting “during the National Day holiday of the Mid Autumn Festival.

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