When does the dog days of summer begin in 2018? What are the causes of the dog days of summer?
Introduction: There is a Chinese saying that "train hard in the hottest days of summer and in the coldest days of winter", and the hottest days of summer are the hottest period of the year. So when does the hottest days of summer begin in 2018? What are the reasons for their formation? The sixth month of the lunar calendar is approaching quietly, and the flowers, plants and trees are all smiling to welcome the arrival of summer. The Fortune Teller website will help you understand the days of the sixth lunar month in 2018!When does the dog days of summer begin in 2018?The dog days of 2018 begin on July 17, 2018.The duration of the dog days in 2018: 40 days in total July 17, 2018 - July 26, 2018, the first dog days, 10 days July 27, 2018 - August 15, 2018, is the middle of the dog days, 20 days August 16, 2018 - August 25, 2018 is the last dog days. The 10-day dog days are calculated according to the lunar calendar, which is approximately from mid-to-late July to early August in the Gregorian calendar. The time of the beginning of the dog days is not fixed every year, and the length of the middle dog days is also different. It is necessary to check the calendar to calculate. The date of the beginning of the dog days can be simply expressed by the four-character formula "Summer Solstice San Geng", that is, starting from the third "Geng" day after the summer solstice. The first dog days is 10 days, the middle dog days is 10 days or 20 days, and the last dog days is 10 days. Starting from the summer solstice, according to the arrangement of the Ganzhi calendar, the third Geng day is the first dog days, the fourth Geng day is the second dog days, and the first Geng day after the beginning of autumn is the last dog days. When there are 4 Geng days between the summer solstice and the beginning of autumn, the middle dog days lasts 10 days, and when there are 5 Geng days, it lasts 20 days. It can be inferred that the early or late appearance of Geng day will affect the length of the dog days, so in some years the dog days last for 30 days, while in other years they last for 40 days. According to this method of calculation, there are a total of 40 days in the dog days of 2018. Analysis of the causes of the dog days of summer!After the beginning of the dog days, the humidity of the ground becomes higher, and it absorbs more heat every day and emits less heat. The heat on the surface accumulates, so it gets hotter day by day. When the dog days begin, the accumulated heat on the ground reaches its peak, and the weather is the hottest.In addition, there is more rain in summer and the air humidity is high. The heat capacity of water is much greater than that of dry air, which is also an important reason for the hot and humid weather. The subtropical high pressure strengthens in July and August. Under the control of the subtropical high pressure, the downward air flow inside the high pressure makes the weather clear and cloudless, which is conducive to sunlight and ground radiation warming, making the weather even hotter. |
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