Which solar term does autumn start from? Which solar term is the beginning of autumn?

1. Starting from beginning of autumn, beginning of autumn is the13rd solar term in 24 solar terms, and beginning of autumn falls on August 7th, 8th or 9th every year. "Autumn" means cool in summer, which means the beginning of autumn.

2. Twenty-four solar terms refer to the special festivals in the trunk and branch calendars that indicate seasons, phenology, climate change and the establishment of "December architecture", reflecting the influence of the sun on the earth and being included in the representative list of human intangible cultural heritage.

3. Twenty-four solar terms are a supplementary calendar to guide farming, which was established in the pre-Qin period in China and completely established in the Han Dynasty. It is a knowledge system formed by observing the movement of the sun in a year and understanding the changing laws of the four seasons, climate and phenology in a year. It divides the sun's annual trajectory into 24 equal parts, and each equal part is a solar term, starting from beginning of spring and ending with the great cold.