I played with him on June 24th. Today is July 20th. How many days before a month?

Year 2015201520162016.

Gregorian calendar

Summer solstice 6.22 5. 7 6.2 1 5. 17

Initial accommodation 7.135.28 7.176.14

Alto 7.23 6. 8 7.27 6.24

Beginning of autumn 8. 8 6.24 8.7 7.5

Volt 8.126.28 8.167.14

Day 40

Air inlet 7.13 5.28 7.17 6.14

Outgoing 8.22 7. 9 8.26 7.24

The dog days are the initial, intermediate and final lodging, and "lodging" means being forced to hide underground. The dog days are the hottest time of the year. It appears from mid-July to mid-August in the solar calendar every year.

Trivolt characteristic

High temperature, low pressure, high humidity and low wind speed.

How many days is a dog day?

Dog days are usually 30 days, and in some years it is 40 days, mainly depending on the number of days in the middle.

Chufu (Fu Tou): From the third Geng Day after summer (referring to the day when the word "Geng" appears on the trunk and branches) to the day before the fourth Geng Day after summer. After summer, the third Geng day is the first day of accommodation.

Middling (two volts): from summer to the fourth Geng day in the future to the day before the first Geng day after beginning of autumn. The fourth Geng Day after long summer was designated as the first day of crouching. If the first Geng day after beginning of autumn is the fifth Geng day from summer to the future, it is divided into 10 days; If the first Geng Day after beginning of autumn is the sixth Geng Day from summer to the future, the middle part is 20 days.

Final lodging: the day before the first Geng Day after beginning of autumn and the second Geng Day after beginning of autumn. After beginning of autumn, the second Geng Day was designated as going out, which means the dog days are over.

Calculation of three volts

If you want to figure out which day is dog days, you must first understand what Geng Day is. Gengri was determined according to the traditional "record method of cadres and branches" in China. The date of each day is composed of heavenly stems and earthly branches (the main branch for short) in turn. Geng is one of the ten-day tasks, and the ten-day tasks are: A, B, C, D, E, G, Xin, Ren and Gui. The twelve earthly branches are: Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai. If the first day is Jiazi; Then the second day is b ugly: the third day is C Yin ... and so on, 60 days is a round, and so on.

How can we find out the dry branch of a certain day? You can read ordinary books, yin and yang calendars or perpetual calendars to calculate. For example, June 18, 20 12 is Geng Day, summer solstice is June 2 1, June 28th is the first Geng Day after summer, and July 18 is the third Geng Day after summer. July 28th is the fourth Geng Day after long summer, that is, Fuzhong; August 7th is the fifth Geng Day from summer to the future, while August 7th is beginning of autumn (Geng Day is in beginning of autumn, which cannot be counted as after beginning of autumn), and the first Geng Day after beginning of autumn is August 17, which is the last day. 20 12 "three volts" is 40 days.

June 13, 20 13 is the Geng day, the summer solstice is June 2 1, and July 13 is the third Geng day from summer to the future, which is the initial stage. July 23 is the fourth Geng day from summer to the future, that is, middling; August 7th, beginning of autumn, August 12 is the first and last day after beginning of autumn. So the "three volts" of 20 13 is 40 days.

It can also be calculated by a simple method. It first appeared in the middle of July in the solar calendar every year. Since every ten days is a Geng Day and a year is 365 days, although it is not an integer multiple of 10, the difference is 5 days, so it is easy to figure out which day is Geng Day. For example, July 18 of 20 12 is Geng Day, then July 13 of 20 13 is Geng Day, and July 18 of 20 14 is Geng Day, and so on, it is easy to calculate Geng Day. However, it should be noted that there is a leap year every four years, and one more day in the leap year is also very easy to calculate. In leap years, it will be one day earlier. For example, July17,2065438 is Geng Day, not July 18.

According to the above method, you can calculate the dog days every year.