It's cold and summer day and night
The equal length of day and night means that autumn is really coming.
Autumnal equinox is the 16th of the 24 solar terms and the fourth in autumn. Douzhiji; the sun reaches 180 ° of the Yellow longitude; it meets every year on September 22-24 of the Gregorian calendar. Equinox means equinox or semi equinox. On equinox, the sun is almost directly on the earth's equator, with the same length of day and night all over the world. After the autumnal equinox, the position of direct sunlight moves to the southern hemisphere, the northern hemisphere gets less and less solar radiation, but the ground loses more heat, and the speed of temperature reduction is obviously accelerated. By the autumnal equinox, the summer heat has disappeared, the weather has turned cool, and the summer and cool are separated.