What is double festival?

It means that the two festivals are very close, only a few days apart. When you bless others, you can say that you are happy in two festivals. The situation of two festivals often appears in daily life. Just like the Mid-Autumn Festival and National Day on 20 15 and 20 17, they are very close, so they are two festivals.

China's calendar is divided into lunar calendar and solar calendar. Also called lunar calendar and solar calendar. Some festivals are calculated according to different calendars. So sometimes two festivals are very close.

The extended message "Mid-Autumn National Day" is mainly due to the leap month. Astronomical experts say that this situation is mainly the result of leap month. According to the director of Tianjin Astronomical Society, the Chinese lunar calendar stipulates that there are 30 days for the big moon and 29 days for the small moon, and a year is 12 months * * 354 or 355 days, which is about 1 1 day less than a tropical year. It will be less than 1 month in four years.

Over time, there will be a strange phenomenon of time sequence and time disorder. In order to solve this problem, the method of adding "leap month" is adopted. The leap month occurred in June this year, which not only delayed Valentine's Day in China, but also delayed the Mid-Autumn Festival. In addition, the Lunar Mid-Autumn Festival generally occurs between September 7th and June 6th in the solar calendar 10, resulting in the calendar phenomenon that the Mid-Autumn Festival coincides with the National Day.