The definition of Chushu: the name of the solar term. Around August 23 of each year. After the end of summer, the temperature gradually drops and the rainfall decreases in most parts of China.

Sushu is one of the twenty-four solar terms. The solar term falls on August 23 or 24 every year and is a solar term that reflects changes in temperature. "Chu" means end, indicating that the heat is about to pass and the temperature will gradually drop in most parts of China.

In ancient times, the period of summer was divided into three periods: "The first period is when eagles sacrifice birds; the second period is when heaven and earth begin to be quiet; the third period is when crops are planted." In this solar term, eagles begin to hunt birds in large numbers; everything in the heaven and earth begins to Wither; the "禾" in "禾 Nai Deng" refers to the general name of millet, millet, rice, and sorghum crops, and "Deng" means mature.

Sushu is different from minor heat, major heat, minor cold, and major cold. It is a solar term that represents the transition from hot to cold.