What is the autumnal equinox? The introduction of the autumnal equinox.

1, the autumnal equinox is the sixteenth of the twenty-four solar terms and the fourth in autumn. Struggle with yourself; The sun reaches the yellow meridian180; Celebrated on September 22-24 of the Gregorian calendar every year. The autumnal equinox means "equal share" and "equal share". On the day of the autumnal equinox, the sun shines almost directly on the equator of the earth, and the length of day and night is equal all over the world. After the autumnal equinox, the direct sunlight moved to the southern hemisphere, and the northern hemisphere got less and less solar radiation, but the ground lost more heat and the temperature dropped significantly. By the autumn equinox, the summer heat has disappeared and the weather has turned cold. In ancient times, there was a folk activity of "Spring Festival to the Sun and the Moon". The autumnal equinox used to be the traditional "Festival to offer sacrifices to the moon", and the Mid-Autumn Festival evolved from offering sacrifices to the moon in autumn.

2. After the autumnal equinox, the direct point of the sun continues to move from the equator to the southern hemisphere, and the days in the northern hemisphere become shorter and the nights become longer, that is, the days in a day are shorter than the nights; The southern hemisphere is the opposite. Therefore, the autumnal equinox is also called the landing point. At the North Pole and South Pole, on the day of the autumn equinox, the sun is on the horizon all day. After that, as the direct point of the sun continued to move southward, a six-month polar night began near the North Pole, which gradually expanded and then narrowed. A six-month polar day began near the South Pole, which gradually expanded and then narrowed.

3. 2065438+621June 2008, the State Council issued an official reply on agreeing to set up "China Farmers Harvest Festival", agreeing to set up the annual autumn equinox as "China Farmers Harvest Festival" from 20 18, and the festival activities mainly include cultural performances and agricultural competitions.