What date does it enter the city every year?

The solar term from the summer solstice in 2020 is June 2 1. Starting from this day, the date of the third Geng Day is July 16, so this year's decline time is this day.

The dog days are divided into the initial, middle and last days. The initial and final days are 10 days respectively, while the intermediate days are 10 days or 20 days. As I mentioned just now, the initial emergence of seedlings began from summer to the third Geng day in the future and ended on the day before the fourth Geng day in the summer. This year, it first appeared on July 16 and ended on July 25th.

The last stage started from the first Geng Day after beginning of autumn. The solar term in beginning of autumn this year is on August 7th, and the first Geng Day is on August 15, so the last stage starts on August 15 and ends on August 24th.

The reason why Zhongfu has 10 days and 20 days is because the time of a year is 365 days, but every 10 day will have a Geng day, and 365 days will not be a multiple of 10, so the Geng day time is not fixed. The results show that if there are four Geng days between the summer solstice and the beginning of autumn, the middle period needs 65,438+00 days; If there are 5 Geng days, it will take 20 days in the middle.

Extended data

Precautions for accommodation:

1, excessive exposure, ultraviolet rays will destroy collagen and elastic fibers, make the skin aging ahead of time, and even cause skin cancer. Strong sunlight can also damage the eyes. In addition, ultraviolet rays are strongest from 10 to 2 pm, so special attention should be paid to sun protection at this time.

2. One of the main reasons for air conditioning is that the temperature difference between indoor and outdoor is too large. Although the human body has a certain ability to regulate body temperature, this ability is limited. The indoor and outdoor temperature difference should not be too large, generally around 8℃- 10℃. Although there may be hot weather above 38℃ in summer, the temperature is below 35℃ for most of the day, so the indoor temperature is about 26℃.