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, 2023, *** 10 days. 2. Mid-Autumn Festival starts and ends from July 2, 20231day to August 9, 2023, with ***20 days. 3. The starting and ending time of the last autumn: August 2023 10 to August 2023 19, *** 10. 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. Midnight time is determined by the number of Geng days between summer solstice and beginning of autumn. If there are four Geng days between the summer solstice and the beginning of autumn, the middle part is 10 days, and if there are five Geng days between the summer solstice and the beginning of autumn, the middle part is 20 days.