1, beginning of autumn and Chushu are all solar terms reflecting temperature changes. Beginning of autumn's "stand" means the beginning, and "autumn" refers to the maturity of crops. Beginning of autumn means that summer will cool down and autumn will begin. "Chu" means to hide and die, and "early summer" means that the hot summer has passed. In other words, the hot summer is coming to an end, that's all.

2. On August 7th or 8th every year, beginning of autumn is regarded as the longitude of the sun's arrival 135. According to the "Twenty-four solar terms": "Autumn also struggles, and things gather here." Beginning of autumn not only indicates the coming of hot summer and autumn, but also indicates that the vegetation is beginning to bear fruit and the harvest season is coming.