I saved the webpage of the weather network for two years, and found that the latest sunrise in Zhengzhou is 65438+1October 7, and the earliest sunset is165438+1the end of October, which are not winter

I saved the webpage of the weather network for two years, and found that the latest sunrise in Zhengzhou is 65438+1October 7, and the earliest sunset is165438+1the end of October, which are not winter solstice. Why? It seems that I analyzed this question for you. Why didn't I answer it? 65438+10.7 is roughly the perihelion of the earth's revolution, that is, the closest point between the earth and the sun. If sunlight can reach Zhengzhou through atmospheric refraction at this position, assuming it is 7: 30, then at perihelion, distance shortens the distance of light, so the sunlight that should have refracted to Zhengzhou at 7: 30 will be refracted to other positions, and the sunrise time seen by Zhengzhou will also change. But the influence of this distance is relatively small, so it may be later than the winter solstice. This is a personal analysis, because I really can't find more convincing information on this issue.

As for 1 1 falling at the earliest, I don't know how to understand it, because I think this problem is related to many factors. I found that although there is a gap, the gap is very small, usually not more than a few minutes, so we have to consider many details, among which I think it is probably related to the atmospheric concentration in that season, or to the air quality and suspended solids in the air, because this will affect the air.

The other is that judging the sunrise itself is not very scientific and accurate, because how is the sunrise judged? Is it the moment when you saw the little tip of the sun coming out? If so, because the sunrise moves very slowly, it is difficult to capture this moment accurately, so I think it is more likely to be an experimental error.