Why is the first Geng Day after beginning of autumn the "last day"?

The first Geng Day after beginning of autumn is the last day of dog days. As the saying goes, "it doesn't end until autumn", which means that the beginning of the autumn solar term will come before the end of the dog days. Beginning of autumn is the first 13 of the 24 solar terms and the first solar term in autumn. Three volts is the general name of the initial, middle and final volts, and it is the hottest period in a year.

The Relationship between beginning of autumn and Sanfu

Beginning of autumn has three times: one is when the cool breeze blows gently, the other is when dew is born, and the third is when cicadas sing. The traditional custom in early autumn is to bask in autumn sacrifices, have a lively autumn party and stick on autumn fat.

Dog days, high temperature, low air pressure, high humidity and low wind speed. The date of dog days is determined by the date of solar terms and the date of dry support.

The third Geng Day after long summer is the beginning of the first lodging, the fourth Geng Day is the beginning of the middle lodging, and the first Geng Day after beginning of autumn is the beginning of the last lodging.