Why are they called dog days and dog days? What do you mean?

1 and is the fourth Geng day after summer. The last stage refers to the day from the first Geng Day after beginning of autumn to the day before the second Geng Day after beginning of autumn, *** 10. The last volt is the last volt of the dog days, commonly known as the autumn tiger. The last few days are cooler in the morning and evening, and the sunshine is still strong during the day.

2, dog days, appearing between the heat and the heat, is the time when the temperature is the highest and humid in a year. "V" means being forced to hide underground. There are three kinds of fu: initial fu, middle fu and final fu, and their dates are determined by the solar terms and dates of the dry branch calendar.