The picture shows the position of the earth in the orbit of revolution during the 24 solar terms in China. The number of days between two adjacent solar terms is about 15 days. Long days in Shenzhen

Judging from the position of the earth in the orbit of revolution during the twenty-four solar terms in the picture, Xiaoman and Dashu are located on both sides of the summer solstice, symmetrically distributed, and the distance during the day is the shortest.