When did you enter the ambush in 23 years?

Dog days in 2023: 1, the first phase starts from July 2023 1 1 to July 20, totaling 10 days. 2. The starting and ending time of the middle session: July 2, 20231day to August 9, 2023, totally 20 days. 3. The starting and ending time of the last autumn: August 2023 10 to August 2023 19, a total of 10 days. Therefore, 23 years is July 1 1.

The dog days are not fixed, although the first and last days are fixed as 10 days. It's just that the mid-lying time is not fixed, some years are 10 days, and some years are 20 days. The midnight time is determined by the number of Geng days between the summer solstice and beginning of autumn. If there are four Geng days between the summer solstice and beginning of autumn, it is divided into 10 days, and if there are five Geng days between the summer solstice and beginning of autumn, it is divided into 20 days.