Why these years are 40 days.

Reason: The first and last days are 65,438+00 days, and the number of days in the middle is not fixed. This is because when there are four Geng days between the summer solstice and the beginning of autumn, the middle part is 65,438+00 days, and when there are five Geng days, it is 20 days, so the period from the middle part to the last few days is sometimes 65,438+00 days and sometimes 20 days. This has caused some years to have 30 days in dog days, some years to have more 10 days because of dog days, and the dog days add up to 40 days.

It is calculated as follows: June 2 1, 2065438 is summer, and the third Geng day after the summer begins to lie down, that is, July 12 volts, and it begins to lie down on July 22. Because August 7th is beginning of autumn Day, to ensure that there is a complete volt behind beginning of autumn, the "middle volt" (the second volt) is 20 days, and the last volt starts on August 1 1 and starts on August 2 1 sunrise. The whole dog days are 40 days.

Extended data:

Astronomical experts said that according to statistics, from 20 15 to 2024, the "three volts" of continuous 10 years is 40 days. The climate of "dog days" is characterized by high temperature and hot summer, and what the people call "bitter summer" is at this time. The "dog days" season is the intersection of "summer heat, summer heat and humidity", and the human body will have a lot of discomfort.

Such as dizziness, fatigue, listlessness, loss of appetite, etc. It is suggested to eat porridge and soup in the morning and evening, which can not only quench thirst, cool down and reduce fever, but also nourish the body, which is conducive to regulating the balance of yin and yang and preventing heatstroke.

People's Network-Why is it forty days in dog days this year?

People's Daily Online -2065 438+05 to 2024, the "three volts" in 10 are all 40.