Why are the dog days called autumn tigers?

The hot weather after dog days is "autumn tiger".

The dog days are determined according to the ancient "method of keeping records of cadres and branches" in China. Every summer to the future, the third Geng Day (referring to the day with the word "Geng" on the trunk and branches) is the beginning period, the fourth Geng Day is the middle period, and the first Geng Day after beginning of autumn is the end period, collectively referred to as the dog days. According to the solar calendar, it appears from mid-July to mid-August. At this time, most parts of our country are the hottest season of the year.

As the saying goes, "it's cold in Sanjiu, and hot in volts." The solar term on July 7 is a light summer, and the ancient book Qunfangpu says, "This is not the end of summer." Because after the slight heat, the hottest dog days of the year are coming. The dog days are the hottest time of the year, with concentrated rain and sunset. Notes on the Sacrifice to the Suburbs in Hanshu said: "The sleeper said that Yin Qi would get up, but he was forced by the sunset and did not get up. Therefore, it is hidden because of the name. "

Autumn tiger means that after autumn, the weather suddenly repeats, and after summer, the temperature is even higher than that in summer, and the heat is unbearable. So these days, autumn tigers are actually more difficult than summer. This weather is particularly hot, but it belongs to autumn.