When is the autumn equinox? What month is it now?

The autumnal equinox falls on September 22-24 of the Gregorian calendar every year.

The autumnal equinox is the sixteenth solar term among the twenty-four solar terms and the fourth solar term in autumn. The sun reaches the yellow meridian180; Every year on September 22-24 of the Gregorian calendar, on the day of the autumnal equinox, the sun shines almost directly at the equator of the earth, and the length of day and night is equal all over the world. The autumnal equinox means "equal share" and "equal share", which means equal share in autumn. After the autumnal equinox, the position of direct sunlight moves south, the days in the northern hemisphere are shorter and the nights are longer, the temperature difference between day and night increases and the temperature drops day by day.

The autumnal equinox used to be a traditional festival to worship the moon, and the Mid-Autumn Festival evolved from the "autumn night to worship the moon". On June 2, 2065438, the people of China and the State Council agreed to set up the "China Farmers Harvest Festival" and agreed to set the annual autumn equinox as the "China Farmers Harvest Festival" from June 20, 2065438.

Meteorological change

According to the lunar calendar, "beginning of autumn" is the beginning of autumn and ends with "the first frost", and the "autumnal equinox" is exactly half of the 90 days from beginning of autumn to the first frost. Since the autumnal equinox, the climate has three main characteristics: the position of direct sunlight continues to move from the equator to the southern hemisphere, and the phenomenon of shorter days and longer nights in the northern hemisphere will become more and more obvious until the winter solstice reaches the longest night and the shortest day; The temperature difference between day and night gradually increases.

The situation in the southern hemisphere is just the opposite. After the autumnal equinox, the position of direct sunlight moves south, the days in the northern hemisphere become shorter, the nights become longer, and the temperature drops, which is of universal significance throughout the country.