beginning of autumn is one of the "four seasons and eight festivals" in ancient times. There is a folk custom to worship the land god and celebrate the harvest.
beginning of autumn is not only an important solar term, but also an important New Year's Day holiday. The customs in beginning of autumn include pasting autumn fat, eating autumn, basking in autumn and eating jiaozi. Autumn is also the harvest season, and there is a folk custom of offering sacrifices to the land gods.
At present, solar terms are determined according to the degree of the sun's yellow meridian. When the sun reaches 135 degrees of the yellow meridian, it will be beginning of autumn, and the time will be from August 7 to 9 of the Gregorian calendar every year.