Brief introduction of autumn solstice

The autumn solstice, 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. On this day, the sun reaches longitude 180 degrees and points directly at the equator of the earth, so the 24 hours of this day are divided equally, each being 12 hours; There is no extreme day and night phenomenon in the world. In ancient China, the autumnal equinox was divided into three periods: "When thunder comes, the sound will stop;" Second, wait for scorpion blank households; Wait for the water to dry. "