We often say that entering Sanfu is the hottest day of the year. What does Sanfu mean? When will the dog days come in the summer of 2018? What is the time of the dog days? Let's get to know with Xiaobian.
What is the date of ambush in 2018
The fall time in 2018 is July 17, 2018, 'three dog days' up to 40 days.
As for this year's "three dog days", on July 17, the "first ambush", on July 27, the "middle ambush", on August 16, the "last ambush" and on August 26, the "ambush".
Three dog days schedule in 2018:
10 days in the beginning of 2018: July 17, 2018 to July 26, 2018;
20 days of medium voltage in 2018: July 27, 2018 to August 15, 2018.
Last 10 days in 2018: August 16-25, 2018.
What do you mean by three dog days
The three dog days, which appear between Xiaoshu and Chushu, are the days with the highest temperature, humid and sultry in the year. The "Fu" of the "three dog days" refers to the "Fu Xie", that is, the so-called "six evils" in the summer evil.
Three dog days appear in the summer heat and heat, is the highest temperature and humid, sultry day of the year. The so-called "dog days" refers to the "three dog days" of the lunar calendar, which is the hottest period of the year. It can be understood that "Fu" means that the weather is too hot to move. But the reason why it is called "Fu" is that there are many cold factors. Sanfu is the hottest 30 or 40 days of the year in Central China. Sanfu is calculated according to the lunar calendar, which is between the late July and the early August of the lunar calendar.
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. In ancient China, the 'ganzhiji Japanese method' was popular. 60 groups of names, which were matched by 10 heavenly stems and 12 earthly branches, were used to record the dates and circulate them. Every day when there is the word "Geng", it is called "Geng day". The word "Geng" of Geng day is the seventh of the ten Heavenly Stems of "a, B, C, D, e, I, G, Xin, Ren, GUI". Geng day is repeated every 10 days. From the beginning of the summer solstice, according to the arrangement of the days of the GaN and Zhi dynasties, the third day of Geng is the first day of ambush, the fourth day of Geng is the middle day of ambush, and the first day of Geng after the beginning of autumn is the last day of ambush. 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. It seems 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.