Summer is getting deeper and hotter. It's about to enter into the dog days. When will the dog days start in 2018? Let's take a look at the 2018 three volt schedule.
When will the dog days begin in 2018
The dog days of 2018 start from July 17, 2018.
Dog days in 2018: 40 days in total
July 17, 2018 - July 26, 2018, the first fall, 10 days
July 27, 2018 - August 15, 2018, zhongv, 20 days
August 16-25, 2018, last 10 days
The three volts are calculated according to the lunar calendar, which is between the second half of July and the first half of August. The time of ambush is not fixed every year, and the length of the ambush is not the same. It needs to be calculated by consulting books. Simply, the four word formula of 'summer solstice three Geng' can be used to express the date of ambush, that is, from the third 'Geng' day after the summer solstice, the first ambush is 10 days, the middle ambush is 10 days or 20 days, and the last ambush is 10 days.
From the summer solstice, according to the arrangement of the date of the Ganzhi period, the third day of Geng was the first, the fourth day of Geng was the middle, and the first day of Geng was the last. When there are 4 g days between the summer solstice and the beginning of autumn, the median period is 10 days, and 5 g days is 20 days. From this, it can be concluded that the occurrence of the day of Geng will affect the length of the middle volt, so there are some years with 30 days of dog days and some years with 40 days of dog days.
According to this method, the total number of dog days in 2018 is 40 days.