"The Little Sun of the Year" will appear tomorrow!Why is the weather not cool?

At 15:11 on the 4th, the earth arrived at the orbit. At this time, people would see a round of "the smallest sun". Why is the "big" "small" when the sun is "big"? Why is the sun far away, the weather is hot? Astronomical science experts of the Chinese Academy of Sciences revealed the secrets of you.

According to Wang Kechao, the science science director of Zijin Mountain Observatory of the Chinese Academy of Sciences, the orbit of the earth running around the sun is not positive, but an ellipse of 0.0167. Because of this, the distance between the Japanese and ground is not fixed, and the distance is about 5 million kilometers far away from the distance.

Early in early January, the earth passes through the long time in early July, and in early July, it corresponds to the most diameter and minimum moment of the sun in the year.

This year, the time when the earth was running to a long distance was 15:11 on July 4th. At this time, the diameter of the sun is 31 minutes and 28 seconds, which can be called the "smallest sun of the year", which is 3.4%smaller than that of the Japanese diameter diameter that the earth can see during the recent day through January 4 this year.

The orbit of the ellipse also leads to the unevenness of the solar anniversary. After the earth is the slowest at a distance, it is the fastest after the near future, and the length of the interval between seasons is not equal. For example, in the autumn equinox of 2021 to the spring equinox of 2022, it passed 178 days and 20 hours and 12 minutes, and the spring equinox of 2022 to 2022 passed 186 days and 9 hours and 31 minutes.

The time to enter this year is July 16, the hottest period of the year is coming. Why is the sun far away, but the weather is the hottest? Wang Kechao explained that the changes in the distance between the Japanese and ground are not the main reason for seasonal changes. The changes in the four seasons are mainly influenced by Huang Chijiao. Due to the existence of Huang Chijiao, the direct point of the sun on the earth moves between 23 degrees and 26 minutes north and south latitude. In summer, the sunlight of the northern hemisphere is high, the light time is long, and the radiation energy receives has many, so it is the hottest.

Sichuan Observation (Source: Xinhua News Agency)

- END -