When did the dog days begin? Dog days start time and introduction.

1, the dog days begin on the third Geng day after the solstice enters summer.

2. The dog days are divided into three days: the beginning, the middle and the end, one * * * for thirty or forty days. Not only the number of days in dog days is uncertain, but also the starting date of several volts per year is different.

3. In order to calculate the dog days accurately, you need to know the summer solstice and the dry branch calendar. In fact, the starting date of several volts is not based on a fixed date in the solar calendar or the lunar calendar, but is calculated by calendar method.

4. The summer solstice is the 10 solar term among the 24 solar terms, and the time point is between June 2 1 day and the 22nd of the Gregorian calendar every year. On this day, the sun shines directly on the Tropic of Cancer, which is the longest day in the northern hemisphere all year round. The solstice just after summer is the dog days.

5. As the saying goes, "The third watch will count on the summer solstice." The word "Geng" refers to the Geng in the sky. The third Geng Day after long summer is the first day of the first autumn on the solstice.