24 solar terms's formula is as follows:

Spring rains startle spring and clear the valley, and summer is full of mountains and summer is connected.

the autumn is exposed, and the autumn cold and frost fall, and the winter snow is small and the winter is cold.

there will be no change in two festivals every month, with a difference of one or two days at most.

in the first half of the year, it's June 21st, and in the second half, it's August 23rd.

? The origin of 24 solar terms

Twenty-four solar terms originated in the Yellow River valley, which was the crystallization of the long-term experience and wisdom of the working people in ancient China. Farming culture, trunk and branch calendars, observing images and timing.

Twenty-four solar terms refer to the specific festivals in the Ganzhi calendar that indicate seasons, phenology, climate change and establish "December construction", which were used to guide farming in the Han Dynasty. The intersection time of the 24 solar terms is the natural result of celestial movement. It basically summarizes the exact time of the alternation of four seasons in a year and the law of some natural phenomena such as phenology in nature.