What is the origin of the solar terms in summer?

1. Every year from July 22nd to 24th, when the sun reaches longitude120th, it is the solar term of "Great Summer".

2. "Big summer", like "Little summer", is a season that reflects the degree of summer heat, and "Big summer" means extremely hot. "Twenty-four solar terms": "Summer, summer is also divided into sizes, the early month is small, the month is big, and it is still hot today." At this time, before and after the "mid-crouching", most parts of the country entered the hottest period of the year, and it was also the fastest growing period of warm-loving crops.

3. The ancient summer heat in China is divided into three periods: "Rotten grass is firefly; Second, wait for the soil to moisten and cool off the heat; It will be fine when it rains. " The first time was the summer heat, when fireflies hatched. The ancients thought fireflies were made of rotten grass. The second kind of weather means that the weather becomes sultry and the land is wet. "Three seasons" means that there are frequent thunderstorms. This heavy rain weakens the heat and humidity, and the weather begins to transition to beginning of autumn.