The traditional foods eaten at the beginning of autumn are eggplant, watermelon and so on. Eating eggplant at the beginning of autumn originated from the Ming Dynasty. In order to reward soldiers, it has been handed down that eggplant with meat feeling is used instead. In the south of the Yangtze River, there is a custom of eating watermelon at the beginning of autumn. Leaving the seeds to burn in the stove can avoid the plague for a year.
The beginning of autumn is the 13th of the 24 solar terms. The first solar term in autumn is handed over from August 7 to 9 of the Gregorian calendar every year. At this time, the handle of the Big Dipper pointed to the southwest, and the sun reached the Yellow longitude 135 °. The 24 solar terms reflect the change of "Qi" in the four seasons. The beginning of autumn is the node where Yang Qi gradually recedes and Yin Qi gradually grows, and gradually changes from Yang Sheng to Yin Sheng. The beginning of autumn also means that precipitation and humidity are at the turning point of the year and tend to decline or decrease; In nature, all things begin to grow from lush to bleak and mature.
Autumn does not mean the end of the hot weather. The beginning of autumn is still in the hot season and has not yet been out of the summer. The second solar term (summer treatment) in autumn is out of the summer. The weather is still very hot in early autumn. The so-called "three volts of heat" also means "one volt after autumn". There is at least one volt of hot weather after the beginning of autumn. According to the calculation method of "three volts", the day of "beginning of autumn" is often still in the period of medium voltage, that is to say, the heat is not over, and the real coolness usually comes after the Bailu solar term. The watershed between hot and cool is not in the beginning of autumn.