At 2:23 am Beijing time on August 8th, the beginning of autumn, one of the 24 solar terms, will be welcomed. From this season on, the yang energy gradually decreases, and all things become introverted, starting to grow from prosperity to maturity. Tianjin folklore expert and columnist introduced by National Day that although the name of this solar term carries the word "autumn", the beginning of autumn is only the arrival of autumn in the astronomical sense, not the beginning of autumn in meteorology. The division of seasons in climate is mainly based on the variation of the "average temperature of the season", that is, the average temperature of the local area for five consecutive days is below 22 degrees Celsius, which is considered as autumn in the sense of climate. After the beginning of autumn, it takes some time for the heat to dissipate and the temperature to decrease. Many parts of China are still in the midst of hot summer, and there is a folk saying that "the beginning of autumn is opposite to the great heat, and it feels like baking around noon. After falling asleep on July 11th, people who had endured the hot and stuffy weather of "steaming and boiling" for a period of time were extremely eager for a cool autumn breeze to blow earlier. In some regions of China, the folk customs divide the beginning of autumn into "early beginning of autumn" and "late beginning of autumn". Specifically, there are roughly two different classifications: the first classification is based on the seventh month of the lunar calendar. If the beginning of autumn has not yet entered the seventh month of the lunar calendar, it is called "early beginning of autumn". On the contrary, if the beginning of autumn has already entered the seventh month of the lunar calendar, it is "late beginning of autumn". Therefore, the corresponding lunar date for this year's beginning of autumn is June 22, which belongs to "early beginning of autumn"; The second classification method is based on time points. From 0:00 to 12:00, it is "early start of autumn", and from 12:00 to 24:00, it is "late start of autumn". Therefore, this year's start of autumn belongs to "early start of autumn". From this, many proverbs and sayings have also emerged among the people, such as "In the early autumn, it's cool and chilly, but in the late autumn, it's hot and the cows die", "In the early autumn, throw away the fan, and in the late autumn, the heat never stops", and so on. According to the National Day holiday, these folk sayings have been passed down from generation to generation. Although there is some truth, there is no rigorous scientific basis. The main factors that affect the climate are solar radiation, atmospheric circulation, and human activities. Therefore, the beginning of autumn is early or late, and there is no clear corresponding relationship between whether the weather is hot or not. Regardless of the morning or evening of the beginning of autumn, the scorching temperatures have come to an end, and the season is moving towards the "autumn atmosphere". Autumn is known by the falling leaves, and the years greet the abundant. Autumn is the season of harvest and also a season of endless longing. Let's welcome the arrival of the beginning of autumn together in folk activities such as "biting autumn", "touching autumn", and "sticking autumn fat". Let's all say "it's a cool autumn day". (Reporter Zhou Runjian) (Xinhua News Agency)