Does the Great Heat mean the beginning of the dog days? Which day of the dog days is the Great Heat?

Does the Great Heat mean the beginning of the dog days? Which day of the dog days is the Great Heat?
We all know that Dashu is the hottest solar term, but the hottest day is not just one day. We call them the "dog days". The dog days of summer may last 30 days or 40 days. Does the Great Heat mean the beginning of the dog days? Which day of the dog days is the Great Heat? The sixth lunar month of 2019 also ushered in summer. Follow Mr. Shui Mo's website and we will accompany you through a hot summer.

Does the Great Heat mean the beginning of the dog days?

The Great Heat is not the beginning of the dog days. The beginning of the dog days is the third Geng day after the summer solstice. In 2019, the beginning of the dog days is July 12, and the Great Heat solar term is July 23. According to the climate law of the Chinese lunar calendar, our ancestors stipulated that "the third Geng day after the summer solstice is the first Fu, the fourth Geng day is the middle Fu, and the first Geng day after the beginning of autumn is the last Fu. The first and last Fu are ten days each, the middle Fu is ten or twenty days, and the "summer Fu" is thirty or forty days in total. If there is a Geng day on the beginning of autumn and the two days after it, the middle Fu will be ten days, otherwise it will be twenty days, so in most years the summer Fu is forty days.

Which day of the dog days is the Great Heat?

The specific time of the dog days in 2019 is:
The first dog days of 2019: July 12-July 21
Day 1 July 12, 2019 – Day 10 July 21, 2019
The mid-summer season in 2019: July 22-August 10
Day 1 July 22, 2019 - Day 10 July 31, 2019 Day 11 August 1, 2019 - Day 20 August 10, 2019
The last day of summer in 2019: August 11-August 20
Day 1 August 11, 2019 – Day 10 August 20, 2019
According to the above, the Great Heat solar term in 2019 ( July 23 ) is the 12th day of the beginning of the dog days and the second day of the middle of the dog days.

Why are the dog days of summer the hottest?

The four seasons of spring, summer, autumn and winter are named by the five elements scholars as wood, fire, metal and water. There are five seasons in a year: spring, summer, long summer, autumn and winter. From autumn to winter, metal produces water, water produces wood, and wood produces fire, in a natural cycle. But it is not the case from summer to autumn, because fire overcomes metal and metal dares not come out. It means to lie in wait for a period of time. "Latent" is the original meaning of "伏".
After the beginning of the dog days, the humidity of the ground becomes higher, and it absorbs more heat every day and emits less heat. The heat on the surface accumulates, so it gets hotter day by day. When the dog days begin, the accumulated heat on the ground reaches its peak, and the weather is the hottest. In addition, there is more rain in summer and the air humidity is high. The heat capacity of water is much greater than that of dry air, which is also an important reason for the hot and humid weather. The subtropical high pressure strengthens in July and August. Under the control of the subtropical high pressure, the downward air flow inside the high pressure makes the weather clear and cloudless, which is conducive to sunlight and ground radiation warming, making the weather even hotter.
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