On what date does the dog days in 2023 begin?

Mid-Autumn Festival in 2023: July 1 1 to July 20, 2023, totally 10 days; Mid-term starting and ending time: July 2, 20231day to August 9, 2023, totally 20 days; The terminal building collapsed from August, 2023 10 to August, 2023 19, a total of 10 days. There are forty days in dog days in 2023.

The dog days are not fixed, although the first and last days are fixed as 10 days; It's just that the mid-lying time is not fixed, some years are 10 days, and some years are 20 days. The midnight time is determined by the number of Geng days between the summer solstice and beginning of autumn. If there are four Geng days between the summer solstice and beginning of autumn, it is divided into 10 days, and if there are five Geng days between the summer solstice and beginning of autumn, it is divided into 20 days.

The hottest reason in dog days

After lodging, the surface humidity increases, and the heat absorbed every day is more, but the heat emitted is less, and the heat on the surface is accumulated. So it gets hotter every day, and when it enters the dog days, the accumulated heat on the ground reaches its peak and the weather is the hottest.

In addition, there is much rain in summer, the air humidity is high, and the heat capacity of water is much greater than that of dry air, which is also an important reason for the sultry weather. The subtropical high intensified in July and August. Under the subtropical high pressure, the descending airflow inside the high pressure makes the weather clear and cloudy, which is beneficial to sunlight, the ground radiation heats up and the weather is hotter.