Why does the sun look bigger in the morning?

And if you look for something and measure it, you'll find that it's actually the same in the morning as it is at noon.

It's just that there are references in the morning and none or very little at noon.

The sun looks bigger in the morning, but the size of the sun has not changed, but there is a problem with people's vision. Vision is formed in this way, the light emitted by the object is imaged on the retina by the lens (lens) of the human eye, so that the photoreceptor cells sense light, and then the optic nerve transmits the information to the cerebral cortex, and after the information is processed and processed, vision is formed. To a certain extent, the original has been modified.

For example, an object of the same size, a black one appears smaller than a white one, a blue sky in a painting appears farther away than a building, and so on. In short, the contrast between the target and the background, the difference in color, the contrast of the color, etc., will be modified to varying degrees. The same is true for the sun, because in the morning, the sun is rising, the background is darker, and the bright target on the dark back appears larger, plus the morning sun is red, and people use ground objects as references, so the morning sun looks big and round.

This is also true for the evening sun to appear larger, but the evening sun appears flatter due to the refraction of light. At noon, the sun is high in the sky, and with the sky as the background, there is no other reference, so it looks smaller.

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.

Hello! : The morning sun looks bigger than the noon, is it because the sun is closer to us in the morning than at noon?

If we take a picture of the morning and noon suns with a well-adjusted camera and compare them, we will see that they are exactly the same size, so why don't we see them the same?

It turns out that when our eyes look at an object, the size it perceives depends not only on the actual size of the object itself, but also on many factors such as distance, background background, and brightness of the object itself, and sometimes we have illusions.

In the morning, when the sun has just risen over the horizon, because the horizon is far away from us, the trees in the distant background, the houses are too small to be seen, and the sun rises on the horizon in this background, and it looks very large; At noon, the sun hung high in the sky, which was small compared to the tall trees and houses near the earth.

Let's look at Figure 1 again

Figure 1 shows two circles of equal size, but we feel that they are whiter and larger, why do we have such an illusion? It turns out that although the lens in our eyeball is equivalent to a convex lens, and its imaging is satisfied with the imaging law of the convex lens, the outline of the object imaged on the retina is not as clear as that obtained by a adjusted camera on the negative. On the retina, there is always a circle of light around the image, which makes the outline of the image of the object enlarge and feel larger than the real thing. The aperture on the edge of the image seems to permeate from the object, and this phenomenon is called light bleed.

The greater the contrast between light and dark between the object and the background, the more significant the light bleed-through.

In the morning, when the sun has just risen from the horizon, the earth is still in a relatively dim state, and the bright sun will appear particularly large in the dim background, and the sun hanging in the sky at noon is less different from the brightness of the surrounding bright sky, and the light seepage phenomenon is not significant, and it looks small.

Another reason why the sun appears larger in the morning than at noon is that the sun is lower in the morning, and the eyes are at level when we observe, and the lens in the eyeball remains in a normal state, with a smaller degree of convex and a larger focal length, and the image of the sun through the lens on the retina is also larger. At noon, we need to look up to observe the sun, and due to the limitation of the curvature of the head and neck, the sunlight cannot directly enter the human eye, we see the sun is strabismus, in order to get a clear image on the retina, the lens will involuntarily bulge, so that its focal length becomes smaller, and the image formed on the retina will also become smaller, so when looking up, the sun will feel smaller.

The earth revolves around the sun, so the sun is actually the same size when viewed on the earth, but in the morning, the position of the person is parallel to the sun, and from the point of view, the sun is not directly illuminated, and the human eye looks like the sun is a little bigger.

This is mainly due to the difference in the reference, the morning sun is larger because of the earth, and the noon sun. It is farther away from the earth, so it will be a little smaller in comparison. In fact, the size of the sun is fixed.

The sun looks a little bigger in the morning, mainly because the air is better in the morning and the line of sight is better, so it looks like the sun should be a little bigger.

The reason why the morning sun looks bigger, mainly because there is a morning sun, we say that there is a morning sun, the surrounding is full of red clouds, which will also set off, the morning sun looks bigger, mainly because the morning sun is not particularly hot, strong In this case, we can use the naked eye to observe its size, and it will feel bigger.