What does the autumnal equinox mean? The autumnal equinox solar terms will come tomorrow.

The autumnal equinox is the sixteenth solar term in the twenty-four solar terms of the lunar calendar, usually on September 22nd or 23rd every year. The climate in the south began to decline from this solar term. First, the sun reaches 180 degrees on this day, pointing directly at the equator of the earth, so a day is divided into 24 hours, each 12 hours; There is no extreme day and night phenomenon in the world. After the autumnal equinox, the polar night range near the North Pole and the polar sun range near the South Pole gradually expanded.

On September 23rd, 20 15, at 6: 06, 2 1, the "autumnal equinox" solar term officially ushered in, which means that it officially entered autumn.