Is it summer or summer now?

Neither light summer nor heavy summer is the day to start autumn. As the saying goes, "it's hot in dog days." The dog days in China generally appear after the midnight of summer solstice, which is the so-called "midnight of summer solstice".

It is only 15 days from the summer solstice solar term, and the volt number is generally 20 days after the summer solstice solar term. Therefore, it is not counted in summer, and it will enter the dog days about 5 days after the summer solstice solar terms.

Dog days, one volt is ten days, counted by days. Therefore, the dog days are divided into three days, that is to say, after the third day of Gengtian, the summer solstice is the first day, the first volt.

We can simply use the formula of "Xia San Geng" to express the lodging date, that is, from the third Geng day in Xia Hou, the initial lodging is 10 day, the intermediate lodging is 10 day or 20 days, and the final lodging is 10 day. In ancient China, the "trunk-branch calendar" was popular, and 60 groups of different names were used to record dates with 10 heavenly stems and 12 earthly branches, which were recycled. The day with the word "Geng" is called "Geng Day".