What time does Song get up in the dog days?

The dog days song in the solar terms starts from the solstice in summer.

The dog days mean dividing the hottest period of the year into three periods, namely the first, second and third days. From the third Geng day after the summer, the first sequence is ten days, which is called "or initial lodging", and the second sequence is ten days, which is called "middle lodging or". From the first Geng day after beginning of autumn, the next sequence is ten days, which is called volts or three volts.

The number of days of ambush varies from year to year, sometimes 30 days, sometimes 40 days. Some days are older and some days are shorter, all because the days in the middle of the dog days are different.

The time between the head and the tail is fixed, and it is ten days every year. But the midriff is determined by the head and tail, and the number of days in the midriff is not so fixed. There are four shifts between summer solstice and beginning of autumn, with 10 in the middle; There are five Geng days, and the middle is twenty days.