Why is it that the ground on Earth is high and low, but it is round in the universe?

First of all, from the geography book, we can understand that the earth is an irregular elliptical sphere, and its surface is sunken, according to the interpretation of the map, we can know that some areas will be plains, some areas will be plateaus, and some places will have hills, rivers and streams. From a visual point of view, we can look into the distance, and relative to a certain point, there will be a relatively flat area to form a plane with the direction we are standing on, which also causes the difference in our visual perception and understanding.

The second problem is that human perception and knowledge of the planet are limited. For example, we can feel the flowers bloom and smell the fragrance of flowers, we observe through our eyes, listen to sounds through our ears, feel the taste through our noses, and the brain knows a thing through these receptors, which is one-sided and not completely correct.

The earth is a very large sphere, and we cannot judge its true size from the naked eye, but the reason why man is higher than animals is that we have the ability to think, and we can judge and reason through continuous measurement and estimation, through formulas, so as to get a true understanding of the earth. The finite nature of understanding and the infinite nature of development make people always gain a broader and deeper understanding in the infinite development, so as to overturn the incorrect understanding and feeling in the past, which is a tortuous process of continuous progress.

Many times we believe that seeing is believing, that what we see must be true, and at some point we can also use vision to prove whether the earth is a sphere or not. For example, if you stand on a very high plateau and you look into the distance, you will find that the ground level actually has an arc, and in some weather, when you observe the moon, you will find that it actually has cloudy and sunny changes, <>

And in a very special situation, the case of a solar or lunar eclipse will be particularly obvious, the engulfed arc is actually the missing sun or moon we see, of course, with the development of modern economy and technology, human science and technology are changing with each passing day, we can also understand the appearance of the whole earth more intuitively through modern means, and have a more comprehensive understanding of the blue sphere we live in.

Relative to a certain point, there will be a relatively flat area that forms a plane with the direction we are standing in, which also causes the difference in our visual perception and perception.

There will be a relatively flat area that forms a plane with the direction we are standing in, which also causes the difference in our visual perception and perception.

The earth is naturally small compared to the universe. When we look at the earth, we can only see the outline, which is the circle.

Perception and knowledge of the Earth is limited, and with the naked eye we cannot judge its true size, while in space it is quite with the perspective of God.

The Earth is a star in the universe, a giant sphere. At the same time, there are countless stars of this similar form in the universe, all of which are such spheres.

The brain uses these receptors to perceive a thing, which is one-sided and not entirely correct.

As a result, there is a difference in our visual perception and perception.

In fact, the earth is an ellipsoidal sphere, and for human beings, the ground is indeed flat, why? In fact, there is a simple example, a small thing is based on a very large ellipsoid, and what he sees must be flat. It's like an ant on top of a big balloon, and if you look at the ellipse from the ant's point of view, then it must be flat first, and then you will see that it's a sphere or an ellipsoid at an angle.

We can't feel the ellipse of the earth on the earth, in fact, we can't feel many things on the earth, for example, although you are sitting here now, but in fact you are "moving" rapidly, including the ground under your feet, the earth's plate is also moving at any time, etc., in fact, the example of the earth's rotation is to tell everyone that the earth is too big for us humans, and you must observe from an angle to see the essence of the earth.

Because the ancients did not have space telescopes, rockets, and so on, they thought that the sky was round, and the stars, sun, and moon were revolving around us, and the earth was flat, with a dome on it. But modern science has been advancing since the first Soviet satellite, and we can now not only see the Earth from space, but the Earth satellites of various countries can monitor any situation on the Earth anytime and anywhere, not to mention problems on the Earth's ground.

As soon as you reach a certain height, you will see that the ground is not actually flat, it has a certain curvature, and this curvature is also known as the curvature of the earth. The data of scientists shows us the curvature of the earth intuitively, and the rock and land means that a person standing on an endless flat land, its farthest viewing angle is about a kilometer, that is, the curvature of a meter or a kilometer, which we cannot observe.

The endless horizon we saw was a great view.

You can see the footage taken at an altitude of 10,000 meters.

A few days ago, the note7 mobile phone photographed the earth at 33,000 meters,It seems to have a little meaning.,But it's still flat.,Next,It's directly photographed by the astronauts of the International Space Station.,Not to mention near the Kármán line:

The last photo** is of the Apollo 16 astronauts on their way to the moon with a Hasselblad cam of the Earth.

If we live in the center of the earth, not on the surface of the coarse core, it is estimated that we don't even know what shape the earth is, it is a covered cauldron, haha, if you are a Saturnian, the earth you see is a pixel ......It is not clear whether it is round or square, and it is very important to observe with the help of astronomical instruments, after all, the human eye can see things for a limited time.