Which solar term is the hottest, Great Summer or Great Summer?

According to the degree of hot weather, the ancients in China divided the midsummer season into two solar terms: slight summer heat and great summer heat, and then quickly divided the great summer heat. So these three solar terms all contain the word "summer heat". Which is the hottest, the great summer heat or the great summer heat? Let the old almanac answer for you.

The summer heat is the twelfth solar term in the twenty-four solar terms of the China lunar calendar, which is between July 22nd and 24th in the northern hemisphere and between 65438+1October 20th and 2 1 in the southern hemisphere. At this time, before and after midsummer, most parts of China are the hottest period of the year, and the growth rate of heat-loving crops is the fastest. In many places in China, the high temperature of 40 degrees Celsius often occurs.

Summer is the14th solar term among the 24 solar terms of the lunar calendar, and the date of the festival is around August 23rd of the Gregorian calendar. Summer, that is, the "summer" fever leaves, and the summer solar term means entering the autumn in the meteorological sense. After summer, the temperature in the north of the Yangtze River in China gradually decreases. According to the "twenty-four solar terms", "go and go again, and the summer heat ends here." It means that the summer heat will end on this day, and the temperature in most parts of China will gradually drop, and the summer heat will soon pass, especially in northern cities.

Is it hot or hot? As a synonym of heat, "summer heat" was divided into mild summer heat, severe summer heat and summer heat therapy in ancient China. Among them, the temperature in summer is higher than when it just entered the long summer, and with the advancement of the date, extreme high temperature weather will occasionally appear; On the basis of slight summer heat, great summer heat is the highest temperature period in a year. At the same time, due to rainfall and evaporation, the humidity in the air is relatively high, forming a "sauna day" phenomenon, which is the hottest and most difficult period of the year.

The word "early" in summer means termination, indicating that summer is coming to an end; Being in summer is not only different from mild summer heat and severe summer heat, but also different from mild cold and severe cold solar terms. This is a solar term representing the transition from hot to cold. Therefore, compared with the hot summer, we can know that the hot summer is better than the hot summer, and it is also the hottest period of the year.

Why is it so hot in summer? The heat near the earth's surface mainly comes from the sun. Every year from the summer solstice, the sun shines directly on the tropic of cancer, and the earth's surface gets the most heat. Secondly, during the hot summer, the time difference between day and night is large, which is 13 hours during the day and 1 1 hour at night, with a time difference of 2 hours.

Because the days are long and the nights are short in summer, the heat gained during the day is more than the heat radiated at night, and the income and expenditure are unbalanced, so the temperature accumulation near the surface will become larger and larger, reaching the maximum during the summer solar term. It is precisely because of the solar altitude angle and heat budget that the summer solar term temperature is the highest.

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