How many days are there in the dog days of summer in 2018? Which of the three dog days is the hottest?
Introduction: The dog days are a general term for the hottest season in the hot summer. So how many days are there in 2018? Which of the three dog days is the hottest? The Fortune Teller website has carefully compiled detailed information about the sixth lunar month of 2018. If you want to know about the auspiciousness and inauspiciousness of the sixth lunar month, come to Mr. Shui Mo!How many days are there in the dog days of summer in 2018? Which of the three dog days is the hottest?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. Which of the three hottest days is the hottest?The hottest stage of the dog days: the middle dog days1. When talking about which day of the dog days is the hottest, we have to mention a folk saying "It's coldest in the 39th day of the dog days and hottest in the middle of the dog days", which means that the hottest days of the year are the "three dog days", and the "middle of the dog days" is the hottest among the "three dog days". After the last dog days, the weather gradually becomes cooler. 2. First of all, after the beginning of the dog days, the humidity on the ground becomes higher. The ground absorbs more heat every day and emits less heat. The heat in the surface layer accumulates, so it becomes hotter day by day. When entering the middle of the dog days of summer, the heat accumulated in the ground reaches its highest value and the weather is the hottest. 3. 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. This is also an important reason for the sultry weather in the dog days of summer. 4. In July and August, the subtropical high pressure strengthens. 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. 5. After entering the last dog days, the weather gradually becomes cooler. It is cooler in the morning and evening, but still quite hot at noon. It will be different in each region. Because the last dog days are after the beginning of autumn, even though it is commonly known as the "autumn tiger", it is hot during the day but still cool in the mornings and evenings. |
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