Is the Great Heat of 2020 in the middle of the dog days? How to calculate the dates of the dog days?

Is the Great Heat of 2020 in the middle of the dog days? How to calculate the dates of the dog days?
Introduction: The arrival of the Great Heat solar term is in the period of the three hottest days. So, is the Great Heat in 2020 in the middle of the three hottest days? How to calculate the date of the three hottest days? Summer is coming to an end in the sixth month of the Chinese lunar calendar, with heat waves, gusts of wind in the valley, cicadas chirping, and lotus leaves lushly blooming in the fields. If you want to know what knowledge there is about the sixth lunar month of 2020, welcome to Shuimoxiansheng.com!

Is the Great Heat of 2020 in the middle of the three hottest days of the year?

The middle of the dog days in 2020: The middle of the dog days: July 26, 2020 (the sixth day of the sixth lunar month) - August 14, 2020 (the twenty-fifth day of the sixth lunar month)
The date of the Great Heat in 2020: July 22 (the second day of the lunar calendar)
From the above content, we can see that the Great Heat of 2020 is not in the middle of the three hottest days, but in the first hottest day of the three hottest days! The time for the beginning of the dog days in 2020 is July 16, 2020 (the 26th day of the fifth lunar month).
Day 1 July 16, 2020;
Day 2 July 17, 2020;
Day 3 July 18, 2020;
Day 4 July 19, 2020;
Day 5 July 20, 2020;
Day 6 July 21, 2020;
Day 7 July 22, 2020; (Great Heat)
Day 8 July 23, 2020;
Day 9 July 24, 2020;
Day 10 July 25, 2020.
Rufu means entering the dog days of summer.
"The first dog days are counted from the third Geng day after the summer solstice." This is the basis for establishing the first dog days. The calendar stipulates: "The dog days begin on the third Geng day after the summer solstice." This means that starting from the summer solstice, the dog days begin on the third Geng day.
The "Geng day" here refers to the day with the prefix "Geng" in the ancient "Ganzhi calendar".
The date of Gengri is variable and not fixed, so the date of the beginning of the dog days is different every year, but it is always between July 11 and July 21.

How to calculate the date of the dog days of summer?

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 of the Western calendar. The heavenly stem day of that day was Xin Day. 28 days later, it was the third Geng Day. Therefore, July 20th of 2006 was the beginning of the first volt.
Ten days later, it was another Geng day, which was July 30, and we entered the second dog days.
Ten days later, there is another Geng day, and it is the first Geng day after the beginning of autumn, which is August 9th, and it enters the third fu.
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 14th, and it enters the third Fu.
This means that it is very hot after the beginning of the dog days every year, especially the ten days (sometimes twenty days) in the middle of the dog days, which are the hottest.
There is a saying among the people that "the coldest days are in the 39th day of winter, and the hottest days are in the 5th day of summer".
New algorithm in the 21st century - Gengri formula: GR = (D - [Y/4]) MOD 10 (GR Gengri, D even year 1 odd year 6, Y year, [ ] round up, MOD remainder)
The GR of the first dog days is plus 10 (except in 2084), the GR of the middle dog days is plus 20, and when the GR of the last dog days is greater than 7, subtract 1 and when it is less than 8, add 9 (except in 2096, subtract 1). For example, in 2006, GR = (1 - [6/4]) MOD 10 = 0 (10), the first dog days is July 20, the middle dog days is the 30th, and the last dog days is August 9.

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