Which solar term is the hottest, Big Summer or Small 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 soon divided the great summer heat. So these three solar terms all contain the word "summer heat", which one 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 between1October 20th, 65438+ and 2 1 in the southern hemisphere. At this time, most areas of China are the hottest period in a year, and the growth rate of heat-loving crops is the fastest. In many areas of China, 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. Long summer, that is, the "summer" fever will leave, and the long summer solar term means entering the autumn in the meteorological sense. After the summer, the temperature in the area north of the Yangtze River in China will gradually drop. According to the "24 solar terms", "gone and gone, the summer heat will stop here." It means that the high temperature in summer will end on this day, and the temperature in most parts of China will gradually drop, and the high temperature will soon pass, especially in northern cities.

Is it hot or hot? As a synonym of heat, "summer heat" in ancient China was divided into mild summer heat, severe summer heat and summer heat therapy according to different degrees. 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 "Chu" in summer has the meaning of termination, which means that summer is coming to an end; Being in summer is not only different from mild summer, severe summer, slight cold and severe cold, but also represents the transition from hot to cold. Therefore, compared with the high temperature in summer, we can know that the high temperature in summer is better than that in 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 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 earth's surface will become larger and larger, and reach the maximum during the summer solar term. It is precisely because of the solar altitude angle and heat budget that the temperature of summer solar terms is the highest.

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