"Three volts" refers to the first, the middle and the last, about the period from mid July to mid August. After the summer solstice, although the day is shorter and the night is longer, the day is still longer than the night, the heat absorbed by the ground is still more than the heat emitted every day, and the temperature near the ground is higher day by day. By 'three volts', the ground absorbs almost more heat than it emits, and the weather is hottest. In the future, the heat absorbed by the ground will be less than the heat emitted from the ground, and the temperature will slowly drop. Therefore, the hottest time of the year usually occurs in the summer solstice.
From the third 'Geng' day after the summer solstice, the first (10 days), the middle (10 or 20 days) and the last (10 days from the first Geng day after the beginning of autumn) are the hottest days of the year.
Ambush means the beginning of the dog days and the hottest time of the year. So what day is the ambush in 2018? How about the ambush time? Let's follow Xiaobian to understand.
What is the date of ambush in 2018
The time of ambush in 2018 is July 17, 2018.
Ambush means to enter into the dog days. "Summer solstice three Geng number head volt", which is the basis for the establishment of the first volt. The three dog days appear in the summer heat and the beginning of autumn, which is the day with the highest temperature, humid and sultry in 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 "three dog days" appear between "Xiaoshu" and "Dashu", beginning on the third Geng day after the summer solstice every year. The ancients recorded the time with heavenly stems and earthly branches. Every 10 days, there was a day of Geng. Because the days of Geng were different in different years, the time of ambush was different in different years.
How to calculate the time of ambush
There is a formula "three Geng of summer solstice counts the head volt", which means that from the beginning of summer solstice, the third Geng day is the time to enter the head volt, that is, the time to enter the head volt. The whole three dog days lasted from the third day after the summer solstice to the first day after the beginning of autumn.
The calculation of the first fall of the three dog days is the third day after the solar term of the summer solstice in the lunar calendar, that is, from the third day after the summer solstice, the three dog days begin. What is Geng day? Geng day is the day that contains the element of Geng (one of the ten days' work) in the tiangan dizhi chronology. One volt is from the third to the fourth day after the summer solstice. How many days does one volt last? One volt is fixed for 10 days, because the total number of heavenly stems is 10, from one day to the next is fixed for 10 days.
As for whether the incubation period is 30 days or 40 days, i.e. whether there is a MV or two MV, generally speaking, the annual incubation period after July 18 (including July 18) is 30 days, one MV; the annual incubation period before July 17 (including July 17) is 40 days, two MV (both this year and last year). There are only a few exceptions to this rule.
How to prevent heatstroke after ambush
Don't drink when you are thirsty
After a large amount of labor and sports sweating, it is not suitable to drink a large amount of white water, and some light salt (sugar) water should be added appropriately, because after a large amount of sweating, the salt in the human body is lost too much, if the salt is not added in time, the proportion of water and salt in the body will be seriously out of balance, leading to metabolic disorder.
Do not drink too much
In summer, the human body is easily affected by the temperature to accumulate damp heat, and excessive damp heat is the cause of skin ulcers, carbuncle, swelling and toxin. If you drink a lot of white wine, it will help heat and damp, just like adding fuel to the fire.
Standing heatstroke medicine
Hot summer, hot and dry, often make people eat tasteless, sleep not fragrant, prone to dizziness, headache, fatigue, even nausea, vomiting and other symptoms, in order to spend the summer safely, the family should prepare some heatstroke drugs, common drugs and food are: Ten drops of water, Huoxiang Zhengqi water, cool oil, honeysuckle, chrysanthemum, lotus leaf, watermelon.
Learn to take a good nap
In summer, the days are long and the nights are short, the weather is sultry, the sleep time is short, and the sleep quality is poor. If you can take a nap in the afternoon, it's like recharging your brain, which is conducive to physical recovery.