What are the 24 solar terms summed up by the working people?

Twenty-four solar terms are a unique calendar created by summing up the relationship between agricultural production and the sun and meteorology in long-term life practice.

The perfection of the 24 solar terms is the result of summing up the lessons of failure and successful experience on the basis of countless failures and successes. As early as the Spring and Autumn Period and the Warring States Period, China was able to determine four solar terms by measuring the length of the midday sun shadow with soil gauge: winter solstice, summer solstice, vernal equinox and autumn equinox. In a year, the shortest day of the noon soil return shadow is the summer solstice, the longest day is the winter solstice, and the shadow with moderate length is the vernal equinox or autumn equinox.

In ancient times, with the extensive application of farm tools, the area of cultivated land continued to expand, and agricultural activities became increasingly sophisticated and complex. It is becoming more and more urgent for our ancestors to arrange agricultural activities according to the weather. To this end, they combined the observation of the moon phase to determine the content of a year as 12 months, and gradually improved the 24 solar terms. The 24 solar terms are China's original creation and an important discovery in the history of world astronomy. Until today, it still has a guiding role in agricultural production.