The 13th solar term among the 24 solar terms

The beginning of autumn is the 13th solar term among the "24 solar terms" and is also the beginning of autumn. The bucket points to the southwest, the sun reaches 135° of the yellow longitude, and the festival is held on August 7 or 8 of the Gregorian calendar every year.

"Li" means beginning; "Autumn" means the maturity of grain. Changes in the entire natural world are a gradual process. The Beginning of Autumn is the transition from Yang Qi to Yin Qi gradually shrinking and Yin Qi gradually growing.

In nature, all things begin to grow from luxuriance to maturity. The beginning of autumn means that precipitation, humidity, etc. are at a turning point in the year and tend to decrease or decrease.

Starting from the beginning of autumn, the Yang Qi gradually decreases and everything becomes introverted. The Beginning of Autumn, the Beginning of Spring, the Beginning of Summer, and the Beginning of Winter are collectively known as the "Four Lis" and are also one of the "Four Seasons and Eight Festivals" in ancient times.