Are the dog days of summer at the same time every year? How to calculate 2020?
The dog days, as a specific period of time, have a long history in our country. But it seems that the time is not fixed every year, why is that? How are the dog days of summer calculated in 2020? The editor will show you about it now! The month to which the leap month is added is determined according to the rules of the lunar calendar, and is mainly based on the correspondence with the 24 solar terms in the lunar calendar. This year, the leap month of April has arrived. Welcome everyone to visit Shuimoxiansheng.com’s special topic on leap April 2020 to learn more!Are the dog days of summer at the same time every year?The time of the beginning of the dog days is not fixed every year, and the length of the middle dog days is also different. It is necessary to check the calendar to calculate. The date of the beginning of the dog days can be simply expressed by the four-character formula "Summer Solstice San Geng", that is, starting from the third "Geng" day after the summer solstice. The first dog days is 10 days, the middle dog days is 10 days or 20 days, and the last dog days is 10 days.The "ganzhi calendar" was popular in ancient my country. The days were recorded in a cycle using 60 different names formed by matching the 10 heavenly stems with the 12 earthly branches. Any day containing the character Geng is called Geng Day. The "Geng" in Geng day is the 7th of the 10 heavenly stems "Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui", and Geng day repeats every 10 days. Starting from the summer solstice, according to the arrangement of the Ganzhi calendar, the third Geng day is the first dog days, the fourth Geng day is the second dog days, and the first Geng day after the beginning of autumn is the last dog days. When there are 4 Geng days between the summer solstice and the beginning of autumn, the middle dog days lasts 10 days, and when there are 5 Geng days, it lasts 20 days. It seems that the early or late appearance of Gengri will affect the length of the dog days, so in some years the dog days last for 30 days, while in other years they last for 40 days. How to calculate 2020?There are three hot days in a row, each of which lasts for ten days, and this is calculated according to the ten number of the heavenly stems.Therefore, the three dog days are divided into: the third Geng day after the summer solstice is the beginning day of the first dog day. For example, the summer solstice in 2006 was on June 21st in the Western calendar. The heavenly stem day of that day was Xin Day, and 28 days later it would be the third Geng Day. So, July 20, 2006, was the beginning of the first dog days; ten days later, it was another Geng day, that is, July 30, and we entered the second dog days; ten days later, it was another Geng day, and it was the first Geng day after the beginning of autumn, that is, August 9, and we entered the third dog days. If it is 2007, July 15th is the third Geng day, which is the beginning of the first Fu (the first Fu); ten days later, there is another Geng day, which is July 25th, and it enters the second Fu (the middle Fu); ten days later, there is another Geng day, but it is not yet the Beginning of Autumn. After another ten days (the middle Fu of this year has 20 days), there is another Geng day, and it is the first Geng day after the Beginning of Autumn, which is August 14, and it enters the third Fu. That is to say, it is very hot after entering the dog days every year, especially the ten days (sometimes twenty days) in the middle of the dog days, which are the hottest. 21st Century Mental Arithmetic - Geng Day Formula: GR = (D - [Y/4]) MOD 10 (GR Geng Day, D even year 1 odd year 6, Y year, [ ] round up, MOD take the remainder) The GR of the first dog days is increased by 10 (with the exception of 2084), the GR of the middle dog days is increased by 20, and the GR of the last dog days is decreased by 1 when it is greater than 7 and increased by 9 when it is less than 8 (with the exception of 2096, the GR is decreased by 1). 2020 Dog Days Schedule:First day of the dog days: July 16, 2020 (the 26th day of the fifth lunar month) to July 25, 2020 (the 5th day of the sixth lunar month)Mid-summer: July 26, 2020 (sixth day of the sixth lunar month) to August 14, 2020 (twenty-fifth day of the sixth lunar month) Last dog days: August 15, 2020 (the 26th day of the sixth lunar month) to August 24, 2020 (the 6th day of the seventh lunar month) |
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