Start of Autumn means the end of summer and the beginning of autumn in the Chinese lunar calendar. The first thing that comes with Start of Autumn is the change of weather—the gradual drop of temperature. People know that autumn has arrived when they see the leaves begin to turn yellow and fall, which is called "A falling leaf heralds autumn". But at this time, the hot weather is not completely over, and the high temperature usually lasts for a period of time, which is known as "afterheat". Start of Autumn is of great significance to farmers, during which a variety of autumn crops grow rapidly and begin to mature, and the harvest season is approaching.