What's the difference between summer heat and light summer heat?

Summer heat, also known as "dog days", is the manifestation of the hottest period in a year in China's old calendar. It is divided into initial (head) volt, intermediate (second) volt and final (summer) volt.

According to the climatic law of the lunar calendar in China, predecessors have long stipulated: "The third Geng day after long summer is the first day, the fourth Geng day is the second, and the first Geng day after beginning of autumn is the last (summer). Ten days at the beginning and end, ten or twenty days in the middle, and thirty or forty days in summer. " .

Summer is 1 1 of the 24 solar terms in China. The time of light summer is July 7 or 8 every year, and it is light summer when the sun reaches 105. Summer heat, which means hot, is a little hot, not very hot.