Beginning of autumn is the thirteenth of the twenty-four solar terms, and it is the beginning of autumn. The bucket refers to the southwest, and the sun reaches the longitude of 135, and it is celebrated on August 7 or 8 of the Gregorian calendar every year. "Reason" means the beginning; "Autumn" means that the grain is ripe.
The change of the whole nature is a step-by-step process, and beginning of autumn is a turning point in which the Yang gradually closes, the Yin gradually grows, and the Yang gradually gets cloudy.
In nature, everything begins to mature from luxuriance.
Beginning of autumn marks the official start of the Qiu Meng season, which is the third solar term after the Great Summer and the Minor Summer. After beginning of autumn, the weather is still very hot. Traditional Chinese medicine calls the period from beginning of autumn to the autumnal equinox "long summer".