Where is the earth at the autumnal equinox?

The autumnal equinox of the earth is 180 degrees. The autumnal equinox is the midpoint of three months (about 90 days) in autumn. "Fen" in "Autumn Equinox" means "half". The autumnal equinox falls around September 23rd of the Gregorian calendar every year, when the earth reaches longitude 180 degrees. On this day, the sun shines almost directly on the equator of the earth, and the length of day and night is equal all over the world.

The autumnal equinox is the sixteenth of the twenty-four solar terms. On the autumnal equinox, day and night are equal, and then the longer the night, the shorter the day. After the autumnal equinox, the direct point of the sun continued to move from the equator to the southern hemisphere, and the days in the northern hemisphere began to shorten and the nights became longer, that is, the days in a day began to be shorter than the nights; The southern hemisphere is the opposite. The autumnal equinox used to be the traditional "Festival of Sacrificing the Moon". For example, in ancient times, there was a saying that "the sun is sacrificed in spring and the moon is sacrificed in autumn". Mid-Autumn Festival comes from the traditional Mid-Autumn Festival.