When did the four solar terms "Little Summer, Big Summer and beginning of autumn Summer" come into being?

1, Weixia: The time is usually from July 6th to July 7th and 8th every year.

2. Great Summer: July 22nd, 23rd or 24th every year.

3. beginning of autumn: August 7th, 8th and 9th every year.

4. Summer: August 22nd, 23rd or 24th every year.

Extended data

The heat is over

When the sun reaches longitude 150, it is the heat of the 24 solar terms of the lunar calendar. Summer is a solar term reflecting the temperature change. "Chu" means to hide and die, and "early summer" means that the hot summer has passed.

"Twenty-four solar terms" said: "If you go, you will stop, and the summer will stop here." "Chu" means termination, which means that the summer heat is about to pass, the summer heat will end on this day, and the temperature in most parts of China will gradually drop. Being in summer is not only different from mild summer heat and severe summer heat, but also different from mild cold and severe cold solar terms. This is a solar term representing the transition from hot to cold.