What is the origin of the great summer heat?

The summer solar term, the hottest and most difficult time of the year, seems to have nothing but heat. How did a guy with such a hot temper come into being? Then let the ancient almanac show you the origin of summer heat and why it is so hot.

Every year on July 23rd or 24th, when the sun reaches longitude 120, it is called "Great Summer". Astronomical experts explained that the weather was so hot during the "big summer" because since the beginning of summer, the heat absorbed from the ground sun during the day was more than the heat released at night, and the heat continued to accumulate. During the great summer heat, the accumulated heat reached its peak, so the solar term in the great summer heat was the hottest.

Generally speaking, the number of people suffering from heatstroke increases obviously on hot days (called "hot days" in meteorology) when the daily maximum temperature is higher than 35℃. When the highest temperature of the day is above 37℃ (called "hot day" in meteorology), the number of heatstroke will increase sharply, especially in the middle and lower reaches of the Yangtze River under the control of subtropical high. The sunshine is like fire, the wind is small and the humidity is high, which makes people feel sultry.

Nanjing, Wuhan and Chongqing, the "three furnaces" along the Yangtze River, have 17 ~ 34 days of "hot days" and 3 ~ 14 days of "hot days" every year on average. In fact, there are many places hotter than the "three stoves", such as Anqing, Jiujiang and Wanxian. Among them, the average "hot days" in Guixi, Jiangxi, Hengyang, Hunan and Kaixian, Sichuan are more than 40 days, and the whole middle and lower reaches of the Yangtze River are a big stove.

In ancient China, the great summer heat was divided into three periods: "rotten grass is firefly;" Second, wait for the soil to be moist and cool off; When it rains, it will be fine. " There are more than 2000 species of fireflies in the world, which are divided into aquatic and terrestrial species. Terrestrial fireflies lay eggs on hay, and when it is hot, fireflies ovulate, so the ancients thought that fireflies were made of rotten grass. The second weather is that the weather becomes sultry and the land is wet. The third kind of weather is frequent thunderstorm. The heavy rain weakened the heat and humidity, and the weather began to transition to beginning of autumn.

There is a saying: "There is not a drop of lightning in the East, but it can't walk in the West", which means that if lightning appears in the East in summer afternoon, it won't rain here. If lightning is in the west, it will come soon, and it is too late to avoid it. People often call the thunderstorm in summer afternoon "northwest rain" and describe it as "northwest rain, which falls on the road without cars." "Summer rain separates the ridge of the field" and "Summer rain separates the back of the cow". This vividly shows that thunderstorms are often sunny here and sunny there, just like the poem of Liu Yuxi, a poet in the Tang Dynasty: "It is sunny in the east and rainy in the west, but it is sunny on the road."

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