According to the "Twenty-four Solar Terms", "There, the summer ends here." As Bai Juyi said in "Qujiang Love in Early Autumn", "The summer heat dissipates, the temperature drops gradually, and it gradually transitions to autumn." .
Taking five days as the waiting period, the ancients divided the summer vacation into three periods: "one is waiting for the eagle to sacrifice birds, the other is waiting for the heavens and the earth to stop, and the third is waiting for the grain to climb." In this festival, eagles perceive the arrival of autumn early, hunt a large number of birds and pile them on the ground to enjoy them slowly. It seems to be a sacrifice, but it is actually storing food for the winter.
At this time, the weather turned cold, everything between heaven and earth began to wither, and a cool breeze blew, rolling up leaves; At this time, all kinds of crops are ripe and can be harvested. As the saying goes, "Summer is full of rehmannia, and every family repairs the barn", and autumn is another harvest season.