The timetable of three volts in 2023
The dog days can be divided into "one volt (head volt)", "two volts (middle volt)" and "three volts (last volt)". "Fu Tou" refers to the third Geng Day after summer, and "Zhongfu" refers to the fourth Geng Day after summer. The dog days can be divided into "one volt (head volt)", "two volts (middle volt)" and "three volts (last volt)". "Fu Tou" refers to the third Geng Day after summer, and "Zhongfu" refers to the fourth Geng Day after summer. The first Geng Day after beginning of autumn is the first day of dog days.
But if there are five days between the summer solstice and the solar terms in beginning of autumn, there are 20 days in the middle of the solar terms, so there are 40 days in the dog days. Therefore, the lodging time is different in different years, and the length of the dog days is also different. How long the dog days are depends on whether the mid-range is 10 days or 20 days.
Characteristics of dog days:
1, which lies between summer heat and summer solar terms. Its weather is characterized by high temperature, hot weather, much rain, high humidity, low air pressure and low wind speed. This is the highest temperature, humid air and sultry day of the year.
2. The humidity of the ground surface becomes higher after falling, and the heat absorbed every day is more, but the heat emitted is less, and the heat on the ground is accumulated. So it gets hotter every day, and when it reaches three volts, 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 larger than that of dry air, which is also the main reason for the sultry weather. The subtropical high intensified in July and August. Under the control of the subtropical high, the descending airflow inside the high makes the weather clear and partly cloudy, which is beneficial to sunlight. As the ground radiation heats up, the weather becomes hotter.
Baidu encyclopedia-dog days