Mid-Autumn Festival and Teachers' Day are the same day, only three times in this century
Release time:2022-09-08 13:41:25
Xinhua News Agency, Tianjin, September 7- Mid-Autumn Festival and Teachers' Day are coming. Coincidentally, the two festivals appear on September 10 at the same time. Astronomical science popularization experts say that these two festivals occur on the same day, and this kind of' Coincidence; Only three times in this century, which is truly rare.
Mid-Autumn Festival and Teachers' Day“ Happy Meeting&# quo;, Zhao Zhiheng, a member of the Chinese Astronomical Society and a member of the Tianjin Astronomical Society, explained that the calendar established based on the laws of solar variation is called the solar calendar, while the calendar established based on the laws of lunar variation is called the lunar calendar. The calendar established by combining the two is called the lunar and solar calendar. The traditional Chinese lunar calendar belongs to the Yin Yang calendar. The Mid-Autumn Festival falls on the 15th day of the eighth month of the lunar calendar every year.
According to the Chinese lunar calendar, there are 30 days for the lunar month and 29 days for the lunar month, with a total of 12 lunar months totaling 354 or 355 days; In the Gregorian calendar, the Earth rotates around the sun once as a tropical year, with 365 days in the ordinary year and 366 days in the leap year. The difference between the two is about 11 days.
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In order to make up for the difference in days between the year of return and the year of return, so as not to cause a serious disconnect between the months and seasons, the adjustment method is to arrange 13 months in some years, with two identical months, called' Placement&# quo;, The rules for intercalation are determined based on the 24 solar terms.
&Ldquo; Due to the ingenious arrangement of intercalation in the Chinese calendar, the corresponding Gregorian calendar date of the Mid-Autumn Festival each year is either about 11 days earlier than the previous year or the next year, or about 19 days later than the previous year or the next year. This also led to the difference of one month between the earliest and latest Gregorian calendar dates corresponding to the Mid-Autumn Festival& Rdquo; Zhao Zhiheng said.
The statistical results of the 200 years from 1901 to 2100 also confirmed this point. The Gregorian calendar date corresponding to the Mid-Autumn Festival fell on September 7 at the earliest (such as 2052) and October 8 at the latest (such as 1919 and 1938). Therefore, it is normal for Mid-Autumn Festival to be held on any day from September 7 to October 8 of the Gregorian calendar every year.
Teacher's Day was only established in 1985 and is fixed on September 10th of the Gregorian calendar each year. September 10, 2022 is the 38th Teacher's Day in China. The astronomical almanac shows that in the 100 years of this century, Mid-Autumn Festival and Teachers' Day have only three times in the same year, namely 2022, 2041 and 2079. (Reporter Zhou Runjian)