What does "summer heat" mean?

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. Being in the heat is "out of the heat", that is, out of the heat. In summer, the direct point of the sun continues to move southward, the solar radiation is weakened, the subtropical high is also withdrawn southward, and the summer heat gradually disappears.

In ancient times, the summer heat was divided into three stages: "The eagle is a sacrificial bird; Second, wait for the beginning of heaven and earth; Three Hou Wonaideng. " In this solar term, eagles began to prey on birds in large numbers; Everything between heaven and earth began to wither; "Henaideng" refers to millet, millet, rice and sorghum crops, and "Deng" means maturity.