The long summer and the summer solstice, which solar term marks the official arrival of summer?

On May 5th or 6th of each year in the Gregorian calendar, it is long summer when the sun reaches 45 degrees along the yellow meridian. The long summer marks the beginning of summer. However, according to the standard of climatology, summer begins when the average temperature rises to above 22℃ for five consecutive days. In fact, before and after the long summer, the average temperature in most parts of the country is around 18-20℃, which is the mid-spring and late-spring season of "all kinds of red and purple flowers compete for the wild". Only the area south of Fuzhou-Nanling Line has really entered the summer.

The three seasons and climate in long summer are "the sound of crickets", "the appearance of earthworms" and "the birth of melons". This means that in this solar term, cockroaches (or frogs) began to clamor for the arrival of summer, earthworms were busy helping farmers loosen the soil, and wild vegetables were unearthed in the field.

Gregorian calendar every June 2 1 day or 22, when the sun reaches 90 degrees of the yellow meridian, it is the summer solstice. On the day of summer solstice, the sun directly reaches the northernmost part of the year, almost directly to the Tropic of Cancer, and the daylight time in the northern hemisphere reaches the longest, and the farther north it is, the longer it is. For example, Beijing is about 15 hours, and Mohe in Heilongjiang can reach 17 hours or more. There will even be an extreme day in the Arctic Circle and an extreme night in the Antarctic Circle.

From summer to the future, the position of direct sunlight on the ground gradually moves southward, and the daylight time in the northern hemisphere is shortened. Although the summer solstice has the longest day and the highest sun angle, it is not the hottest time of the year. This is because the heat near the surface keeps accumulating and does not reach the maximum.

As the saying goes, "Hot days are in dog days", and the real hot weather is calculated by summer solstice and beginning of autumn. From mid-July to mid-August, the temperature is the highest in all parts of the country, and the highest temperature in some areas can reach about 40℃.

Summary: The ancients thought that elk was yin and deer was yang. The deer's horn faces forward, so it belongs to Yang. On the solstice of summer, Yin Qi was born, and Yang Qi began to decline, so the front antlers began to fall off.

Elk, because it is cloudy, falls in the corner of the winter solstice; Male cicadas sing from summer to the future because they feel the Yin Qi; Pinellia ternata is a shade-loving herb, named after it was born in swamps or paddy fields in midsummer. It can be seen that in the hot summer, some yin-loving creatures began to appear, while positive creatures began to decline.