The last day of the dog days every year is the heat?

Summer is the 14th of the 24 solar terms. On August 23rd every year, the sun reaches 150 degrees. "almanac" said: "fighting refers to five, which is summer heat. Summer will retreat, squat and dive, hence the name. " Summer is a solar term reflecting the temperature change. "Twenty-four solar terms" said: "Go, go, the heat is over." "Out" means hiding and ending. Summer means that the hot summer is coming to an end, because the dog days are over or coming to an end.

"Three volts" is the general name of the initial, middle and final volts, which appears from mid-July to mid-August in the solar calendar every year. According to the climate law of the lunar calendar in China, predecessors have long stipulated: "The third Geng day from long summer to the future is the beginning, the fourth Geng day is the middle (second), and the first Geng day after beginning of autumn is the end (third), and the voltage is ten days * * thirty days." In some years, the "mid-crouch" is 20 days, while * * * is 40 days.