Who is right? Scientific basis

The second pair.

Ignoring the revolution of the earth and considering only the rotation, from the center of the sun to a fixed point on the earth's surface, the distance must be long in the morning and short at noon. It's just that this change in distance is not enough to cause hot at noon and cool in the morning, and the hot at noon and cool in the morning is caused by the angle of incidence of the sun, not the truth mentioned in "Two Children's Debate".

This article is a fable. The article recounts that in ancient times, two children relied on their own intuition, one thought that the sun was close to people in the morning, and the other thought that the sun was close to people at noon. This story illustrates that in order to understand nature and explore objective truth, we must dare to think independently and question boldly; It also shows that the universe is infinite, knowledge is infinite, and no matter how knowledgeable people are, they will not know something, and learning is endless.

The sun is the same distance from the earth in the morning and at noon. Why does the sun look bigger in the morning than at noon? It's a visual error, an illusion.

The same object, placed in a group of objects larger than it, appears small, while placed in a group of objects smaller than it appears large. In the same way, the morning sun rises from the horizon against the backdrop of trees, houses, distant mountains and a small corner of the sky, and in this comparison, the sun appears larger. At noon, when the sun rises high and the vast sky is the backdrop, the sun appears smaller.

Secondly, the white part of the same object appears larger than the black one, and this physical phenomenon is called "photoosmosis". When the sun is rising, the background is a dark and dreary sky, and the sun is exceptionally bright; At noon, the background is a blue sky, and the sun does not contrast much with its brightness, so it appears smaller.

The temperature is higher at noon than in the morning, is the sun closer to us at this time than in the morning? Neither is it. The main reason is that the sun hits the earth obliquely in the morning and the sun shines directly on the earth at noon.

At the same time and in the same area, direct radiation is higher than oblique heat. At the same time, at night, the heat of the sun shining on the ground dissipates, so it feels cool in the morning; At noon, the heat of the sun hits the ground, so it feels hot. The temperature is hot or cold, and it does not indicate how far or near the sun is from the ground.

None of them are right, because the sun is as close to us as we are. Because the reference is different: in the morning we use the tree as a reference, and at noon we use the boundless sky as a reference.

If you put the sun in a group smaller than your own sun, it will appear larger, and if you put the sun in a group larger than your own sun, it will appear smaller.

Both have their own reasons, and I think both are right.

No one is right, it's just as big.

Scientific Explanation of the Two Children's Debate:

The first day of the day is as big as the cover of a car, and in the middle of the day it is like a pan", which is due to the visual error caused by the human eye touching objects. In real life, people have the experience that if you put two circles of the same size, if you put one of them in several large circles and the other in several small circles, you can see that the former is small and the latter is large.

According to the "light infiltration" effect of physics, it is always larger to look at white figures than black figures of the same size.

When the sun rises and sets, there is only one corner of the sky on the horizon, and there are trees and houses nearby. At noon, the sky was against the backdrop, and there was nothing to compare with it, and the sky around it was so bright that it was not too different from the brightness of the sun, so it looked like the sun was smaller.

We know that ground radiation is a direct source of heat to the atmosphere, and the amount of ground radiant energy is related to the amount of solar radiation energy received by the ground. In the morning, the sun is rising, the horizon height is small, the sunlight is obliquely shining on the ground to talk about the cultivation surface, the solar radiation energy absorbed by the ground unit area is less, and the temperature is low, so it is still "cool and cool".

At noon, the sun shines directly on the ground, and the solar radiation absorbed by the ground per unit area increases, and the temperature is high, so "the middle of the day is like exploring the soup". Therefore, it is wrong to infer the distance of the sun by "the far are small and the near are great" or "the near is hot and the far is cold".

Original text: Confucius Eastern calendar, see two children arguing, ask why.

A son said: "I go near at the beginning of the sunrise, and I am far away in the middle of the day." "A child is far away at the beginning of the day, and the middle of the day is near.

And in the middle of the day, it is like a pan, which is not small for the far and big for the near? ”

A son said: "The beginning of the day is cool, and the middle of the day is like a soup, this is not hot for the near and cold for the far?" ”

Confucius couldn't decide.

The two children smiled and said, "Who knows more about you?" ”