Why does Mid-Autumn Festival coincide with National Day this year? How many years have Mid-Autumn Festival and National Day fallen on the same day?
Mid-Autumn Festival is the day of reunion, and National Day is the day of national celebration. The reunion day and the national day coincide, which makes all people happy! So, what’s the matter with Mid-Autumn Festival coinciding with National Day? How many years have the Mid-Autumn Festival and National Day been on the same day? As we enter the eighth lunar month of 2020, the temperature has finally dropped. What kind of development trend will our fortune show? Pay attention to the relevant content of the eighth month of the lunar calendar in 2020 on Shuimoxiansheng.com and we will give you detailed answers!What's going on when Mid-Autumn Festival coincides with National Day?Astronomical experts said that the situation of Mid-Autumn Festival and National Day falling on the same day is mainly the result of a leap month.Zhao Zhiheng, director of the Tianjin Astronomical Society, said that China's lunar calendar stipulates that a long month has 30 days and a short month has 29 days. The 12 months in a year total 354 or 355 days, which is about 11 days less than the number of days in a tropical year. Over four years, that's more than a month less. Over time, strange phenomena such as disorder of time and weather will occur. In order to solve this problem, the method of adding a "leap month" was adopted. This year, the leap month occurred in June, which not only postponed the Chinese Valentine's Day, but also the Mid-Autumn Festival. In addition, the lunar Mid-Autumn Festival generally occurs between September 7 and October 6 in the Gregorian calendar, resulting in the calendar phenomenon of Mid-Autumn Festival coinciding with National Day. "If the leap month of the lunar calendar is added before August, it will most likely result in the Mid-Autumn Festival and National Day 'happily coincide'," said Zhao Zhiheng. Astronomical experts also said that it is a normal calendar phenomenon for Mid-Autumn Festival to coincide with National Day. How many years have the Mid-Autumn Festival and National Day been on the same day?There is no completely fixed pattern, but it repeats roughly every 19 years. A small number of years are not, mainly due to the leap year in the lunar calendar.The number of days in each month in the lunar calendar is established based on the moon's movement cycle. In fact, the average number of days in a month is 29.5306 days. If multiplied by 12, there are only 354.3672 days in a year. The earth's revolution around the sun in one cycle (tropical year, solar year) is 365.2422 days. Therefore, the actual number of days in a lunar year is 10.875 days less than that in a solar year, which is almost 11 days, and 209 days less in 19 years. 209 days divided by 30 is 6.9666, which means that in 19 years, the lunar year is almost 7 months shorter than the solar year. In order to make the difference between the lunar calendar and the solar calendar not too big, these 7 months must be added. In order to make up for these seven months, people adopted the method of adding leap months in the lunar calendar - seven leap months in nineteen years. That is, in the nineteen years of the lunar calendar, 12 are ordinary years, each with 12 months; plus seven leap years (the 3rd, 5th, 8th, 11th, 14th, 17th and 19th years), each leap year has 13 months. In this way, the number of days in 19 solar years is almost equal to the number of days in 19 lunar years. Therefore, every time a birthday is 19 or a multiple of 19, there is a chance that the solar birthday and the lunar birthday will occur on the same day. In which years does Mid-Autumn Festival and National Day fall on the same day?The years that have overlapped are 1944, 1963, 1982, and 2001. There is also 2020 and 2031.The most recent time that Mid-Autumn Festival and National Day fell on the same day was in 2020. The 2020 Mid-Autumn Festival was on Thursday, October 1, which was August 15 in the Gengzi Year (Year of the Rat). |
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