"Autumn Equinox" on 23rd: Summer retreats and autumn is cool, and day and night are long.

"Summer retreats and autumn is cool, and the sun and the moon are the same length." According to China's astronomical calendar, September 23rd 15: 50 ushered in the solar term "autumnal equinox" and officially "entered the autumn". Experts reminded that with the arrival of the "autumnal equinox" solar term, cold air began to become increasingly active, and the cooling rate was significantly accelerated. The public should pay attention to adding autumn clothes to prevent colds.

It is understood that the "autumnal equinox" solar term begins every year around September 23rd when the sun reaches 180 degrees. The minute is half, and the autumnal equinox is the midpoint of 90 days in autumn. At the "autumnal equinox", the sun shines almost directly at the equator, and the global day and night are equal in length; After the autumnal equinox, the days in the northern hemisphere are short and the nights are long. In this festival, maple leaves are red as fire, rice is yellow everywhere, osmanthus is fragrant everywhere, crab and chrysanthemum are yellow everywhere, and autumn colors are charming and intoxicating everywhere.

"The Millennium is divided into autumn nights, and it is cold all night." Since the "autumnal equinox", the temperature in China has dropped faster and faster, the weather has turned cold, and the temperature difference between day and night has increased. Wild geese and swallows have begun to fly from the north to the south in droves.