As light as Songhua and powder blue, Lu Xiao in early winter ushered in the autumn equinox.

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. On this day, the sun reaches the longitude of 180 degrees, and points directly at the equator of the earth, so the day is divided into 24 hours, each 12 hour.

The change of seasons seems to alternate in an instant. Yesterday was a colorful world, but this morning it was covered with a mysterious and glittering white sand. According to China's ancient beginning of spring, Changxia, beginning of autumn and beginning of winter, the four seasons are divided, and the autumnal equinox lives in autumn for 90 days, which is equally divided.