When will the dog days start in 2018? the schedule for dog days in 2018

Dog days are the hottest days of the year, and it is also a good opportunity to cure winter diseases in summer. So when will the dog days begin in 2018? Let's take a look at the 2018 dog day schedule with the editor!

When will the dog days begin in 2018?

The dog days in 2018 begin on July 17, 2018.

Dog days in 2018: 40 days in total

July 17, 2018-July 26, 2018, for the first time, 10 days

July 27, 2018-August 15, 2018, moderate volt, 20 days

August 16, 2018-August 25, 2018, the last volt, 10 days

Sanfu is calculated according to the lunar calendar, about between mid-late July and early August in the Gregorian calendar. The time of ambush is not fixed every year, and the length of ambush is also different. it needs to be calculated in the almanac. The four-word formula of "the Summer Solstice Sangeng" can simply be used to express the date of ambush, that is, from the third "Geng" day after the Summer Solstice, the initial ambush is 10 days, the middle ambush is 10 or 20 days, and the last ambush is 10 days.

Starting from the Summer Solstice, according to the arrangement of the dry and branch days, the third day is the first day, the fourth day is the moderate day, and the first day after autumn is the last day. When there are 4 G days between the Summer Solstice and the Beginning of Autumn, the middle time is 10 days, and the occurrence of 5 G days is 20 days. From this, it can be concluded that the appearance of the day G will affect the length of the volt, so there are 30 days in some years and 40 days in some years.

According to this method, the total number of dog days in 2018 is 40 days.

The reasons for the formation of dog days

After the ambush, the surface humidity becomes larger, the heat absorbed every day is more, the heat emitted is less, and the heat on the surface accumulates, so it gets hotter every day, entering three volts, and the accumulated heat on the ground reaches its peak, and the weather is the hottest.

In addition, there are more Rain Water in summer, the air humidity is high, and the heat capacity of water is much larger than that of dry air, which is also an important reason for the muggy weather. The subtropical high strengthened in July and August, and under the control of the subtropical high, the downdraft inside the high pressure made the weather clear and cloudy, which was conducive to sunny exposure, and the ground radiation increased, making the weather even hotter.

It's the hottest in dog days.

The hottest stage in dog days: moderate volts

1. When it comes to which volt is the hottest in dog days, it is necessary to mention a folk saying, "cold in 39, heat in moderate volt", which means that the hottest day of the year is "three volts", while "moderate volt" is the hottest in "three volts". The weather is getting cooler after the last fall.

2. First of all, because after the ambush, the surface humidity becomes larger, the ground absorbs more heat every day, the heat emitted is less, and the heat on the surface accumulates, so it gets hotter every day. When you enter the middle volt, the heat accumulated on the ground reaches the highest value, and the weather is the hottest.

3. In addition, there are more Rain Water in summer, the air is humid, and the heat capacity of water is much larger than that of dry air, which is also an important reason for the muggy days.

4. In July and August, the subtropical high is strengthened. Under the control of the subtropical high, the downdraft inside the high makes the weather clear and cloudy, which is conducive to sunlight exposure. When the ground radiation increases, the weather becomes hotter.

5. After entering the last day, the weather is getting cooler, it is cooler in the morning and evening, and it is still hotter at noon, which varies from region to region. Because the last fall is after the Beginning of Autumn, even if it is commonly known as the "autumn tiger", it is hot during the day and cool in the morning and evening.

How to determine the date of three volts

Chu Fu, according to the Chinese calendar, this is the beginning of a real summer day. People often say: hot in three volts, cold in thirty-nine. Dog days are the season with the highest temperature and humidity in a year, which is divided into initial volt, middle volt and last volt, in which both initial volt and last volt are fixed at 10 days, 10 days in some years and 20 days in some years.

At the beginning of the incubation period, it is called ambush or alternation, and at the end of the incubation period, it is called volley. The number of mid-volt days depends on the alternation sooner or later, generally before July 28, 20 days, July 29, 10 days.