A few days after the slight summer heat is the first day of 202 1.
1, the first few days after the summer heat are 202 1, and the fourth day after the summer heat is the first day. "First crouching", also called crouching and bowing, is the first dog day in the dog days. Summer is three years old, so the third Geng day after the summer solar term (dry branch year) is 202 1, which is on June 2 1, so the first rainy day starts from July 1 1. The summer solar term of 202 1 is July 7th, and May 28th of the lunar calendar.
2. When is the first Geng Day in the hot summer?
The dog days are calculated according to the "Geng Day" after the summer solstice solar terms, with the head falling on the third Geng Day from summer to the future, the middle falling on the fourth Geng Day, and finally falling on the first Geng Day after beginning of autumn. Usually, the dog days begin with the summer solar terms, so usually the first Geng day of the summer heat will be the head. Generally, the head and tail are fixed for 10 days, with 20-30 days in the middle, so the dog days generally last for 30-40 days.
3. Climate characteristics in dog days The climate is characterized by high temperature, low pressure, high humidity and low wind speed. This is the hottest season of the year, because the days in summer are longer than the nights, so the sunshine time is longer. The heat absorbed by the surface is far greater than the expenditure, which will increase the heat accumulated on the surface every day and the temperature will continue to rise. In dog days, the accumulation of surface heat reached its peak. In summer, there is much rain, the air humidity is high, and the heat capacity of water is much greater than that of dry air, so it is easy to have sultry weather in summer.