Traditional Culture Encyclopedia - The 24 Solar Terms - 202 1 What are the dog days?
202 1 What are the dog days?
2. According to the traditional calculation method in China, the third and fourth Geng days from summer to the future are the start dates of the first (head) and second (middle) lodging respectively, and the first Geng day after beginning of autumn is the first day of the last (third) lodging. The length of the dog days is not exactly the same every year. If the middle section ends after beginning of autumn, it is 30 days. If the middle section ends before beginning of autumn, it will be 40 days (20 days in the middle section).
3. Climatic characteristics in dog days: High temperature, low pressure, high humidity and low wind speed are the hottest seasons in a year. This is because, in summer, the day is longer than the night, the day is longer and the sunshine time is longer. The heat absorbed by the surface is far greater than the expenditure, which makes the heat accumulated on the surface increase day by day and the temperature continues to rise. In midsummer, that is, in dog days, the accumulation of surface heat reaches its peak. In summer, there is much rain and high air humidity, and the heat capacity of water is much larger than that of dry air, which is also one of the important reasons for the sultry weather.
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