Introduction to the origin of summer hot solar terms

Great summer heat is one of the 24 solar terms. Every year from July 22nd to 24th, the sun reaches120th. Summer solar terms also belong to the mid-festival stage, which is the hottest stage every year. Ancient Chinese records that "in mid-June, slight summer heat can be seen" and "fifteen days after slight summer heat" means non-great summer heat, and it is in mid-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. "

Therefore, many ancient books in China have talked about the solar terms in summer. The ancient summer heat in China is divided into three periods: "Rotten grass is firefly; Second, wait for the soil to moisten the sea; It will be fine when it rains. " There are more than 2000 species of fireflies in the world, which are divided into aquatic and terrestrial species. Terrestrial fireflies lay eggs on hay, and when it is hot, fireflies ovulate, so the ancients thought fireflies were made of rotten grass. The second weather is that the weather becomes sultry and the land is wet. The third kind of weather is frequent thunderstorm, which weakens the heat and humidity, and the weather begins to transition to beginning of autumn.