When did the 201July 4 18 enter the volt?

Falling is not a solar term, so there is no such thing as a few minutes and seconds. Solar terms are a specific position of the earth in the orbit of revolution, so there is an accurate time.

The dog days theory is a vague concept, which is used to describe the hottest period in a year, not solar terms.

The lodging time is different every year, which is artificially stipulated: the first day of lodging is from summer to the third Geng day in the future; The first Geng Day after beginning of autumn is the first day of dog days. The days between the head and the dog days are called dog days. Fu Tou and Sanfu are both 10 days, but the number of days in Defoe is uncertain. Some years are 10 days, while others are 20 days, depending on the solar terms in beginning of autumn.

20 13, with 20 days' voltage; The second volt this year is only 10 days. Because August 7th is beginning of autumn's "Geng Xu" Day, which is the first day of dog days.

Remember: 105 beginning of winter is the third boxer whose head falls behind long summer. In this way, you can refer to the perpetual calendar and calculate the days when you come in and out.