What does summer heat mean?

Summer means that the hot summer is over.

Summer is the fourteenth of the twenty-four solar terms, and autumn is the second. Dou Zhiwu (Southwest); The solar meridian reaches150; August 22-24 of the Gregorian calendar every year. Summer has arrived, which is the "last summer" in the "three summers" of hot and hot weather, which means that the hot and difficult weather is coming to an end.

After the summer heat, the direct point of the sun continued to move southward, the solar radiation weakened, the subtropical high retreated southward, and the summer heat gradually disappeared. Thunderstorm activity is not as active as summer, and the general trend of rainstorm in all parts of the country is weakened. There are many folk activities in summer, such as eating ducks, setting off river lanterns, opening fishing festivals, decocting medicinal tea and offering sacrifices to the land.

Entering summer is a solar term that reflects the change of temperature. The original meaning of "going out" means "stopping" and "staying". "Shuo Wen Jie Zi" says: place, stop. "Summer heat" means that the unbearable hot weather has come to an end and the summer heat has begun to fade. "Three summers" and three volts represent hot and humid weather, and the curves on the time axis and the temperature axis are basically the same: summer comes, summer comes; When the sky falls, summer is over.

There are "three summers" in the 24 solar terms, namely, little summer, big summer and long summer, followed by early summer, heatstroke and late summer. There is also a "beginning of autumn" solar term in the middle of three summers, followed by beginning of autumn, and the heat lasts for a long time. Long-term intense heat is beneficial to the growth and yield of crops. The ancients called the period from beginning of autumn to the autumnal equinox "long summer".

The dog days include four solar terms: Little Summer, Big Summer, beginning of autumn and Summer Outage. By the summer Outage, the dog days have passed or ended. The summer heat subsides slowly, and it doesn't get cold as soon as it drops. Although the summer solar term is still hot, the temperature has generally begun to show a downward trend.

In summer, the bucket handle of the Big Dipper points southwest (E position). When the sun reaches longitude 150, the node time is around August 23rd in Gregorian calendar.

In summer, the direct point of the sun has moved from 23 26' north latitude to1128' north latitude. At this time, if you watch the Big Dipper at night, you will find that the curved bucket handle still points southwest. The arrival of the hot summer also means entering the second half of the dry calendar.