September 23, 2021 is China's 16th solar term-autumnal equinox of the year.
On the autumnal equinox, the sun is almost directly at the equator of the earth, and day and night are equal in length around the world.
There are three characteristics after this day: 1. Thunder means the end of the heat; 2. Hibernating insects prepare their caves; 3. Dry weather.
Sweep the official account