Why is summer heat called summer heat? Why is summer vacation a solar term in autumn?

"Twenty-four solar terms" records: "Wherever you go, it ends here, and the summer ends here." "Chu" means hidden and ruthless; In summer, it is "going out of summer", which means leaving in the heat. The summer heat got its name.

Entering summer is "going out in summer", which means leaving in the heat, which means that autumn with meteorological significance is about to enter, and entering summer represents the solar term in which the temperature turns from hot to cold. The climate of this period is characterized by falling temperature and crisp autumn, so it belongs to the autumn solar term.

After the intense heat, the weather turned cold. It is hot at noon and cool in the morning and evening, resulting in a large temperature difference between day and night. The climate characteristics of "one autumn rain and one cold" are obvious. The climate with hot days and cool nights forms a good condition for the convergence of human yang. It should be noted that due to the low temperature, strong wind and strong light in the morning and evening, it is necessary to appropriately increase clothes to keep warm, prevent wind and prevent sun, so as to avoid catching cold, wind and solar dermatitis.