The origin of the great summer heat in the twenty-four solar terms

1, when the sun reaches longitude 120, it is a summer solar term. Like Xiao Shu, Da Shu is a festival that reflects the degree of summer heat, and Da Shu is extremely hot. Twenty-four solar terms: in mid-June, the summer heat is also divided into different sizes, small at the beginning of the month and large in the month, and it is still hot now.

2. "Tongwei Filial Piety Helps the Gods" says: "The fifteenth day of Xia Hou is not a big summer, but in the middle of June. The small ones and the big ones are extremely hot, and they are divided into sizes. It was small at first, and it became big after reading it. " Barrel refers to C as great summer heat, and the weather in Sri Lanka is fiercer than small summer heat, so it is called great summer heat.