We can say that the earth moves around the sun, but we can t say that the sun moves around the earth

If no reference is specifically indicated, the reference for these two planets is the solar system. Just as we usually say that the speed of cars, trains, and airplanes is relative to the earth. Have you seen a car dealer advertise a speed parameter with a reference object?

In the same way, you can't say that you are walking on the road as if you are pedaling the earth, and you can't say that the person with the big top is standing in space and lifting the earth, because you are not specifically referring to people and not the earth.

To sum up, if there is no specific reference, then it is necessary to think and solve problems according to the habit of thinking or convention. Thus"We can say that the earth moves around the sun, but we cannot say that the sun moves around the earth"This statement is true!

Most people are accustomed to using the sun as a reference. In fact, if you take the earth as a reference, then the sun moves around the earth.

As for whether it's right or not, you can refer to the 2nd floor.

If the earth is used as a reference, then the sun revolves around the earth. If the sun is used as a reference, then the earth revolves around the sun.

Wrong. Using the earth as a reference, the sun moves around the earth.

It should be true, but it is true according to heliocentrism, and it seems wrong according to Einstein's theory of relativity

No, although the earth also has a force on the sun, this force is much smaller than the force of the sun on the earth, but it is impossible to judge because the reference object is different.

No, there must be a reference for movement.

The sun is big, the earth is small, and the earth runs around the sun.

The earth is big, the moon is small, and the moon runs around the earth. The earth is a planet in the solar system, and the earth revolves around the sun, and one rotation is 1 year in the solar calendar; The moon is a satellite of the earth, and the moon's rpm around the earth is a lunar month; The sun is the center of the solar system, the earth is a planet in the solar system, and the moon is a natural satellite of the earth.

In the Earth-Moon planetary system, the moon revolves around the earth, and the earth keeps rotating to produce the difference between day and night, when the three are lined up in a straight line, there will be a solar eclipse or lunar eclipse, when the moon blocks the sunlight from the earth in the middle, there is a solar eclipse, and when the earth blocks the sun from shining on the moon in the middle, there is a lunar eclipse.

The relationship between the sun, the earth, and the moon

1. The earth is a planet of the solar system, and the earth revolves around the sun, and one rotation is one year of the solar calendar.

2. The moon is a satellite of the earth, and the moon revolves around the earth for a lunar month.

3. The sun is the center of the solar system, the earth is a planet in the solar system and the moon is a natural satellite of the earth, the earth and the moon.

4. The planetary system that is formed revolves around the sun, resulting in the difference of the seasons on the earth.

5. In the Earth-Moon planetary system, the Moon revolves around the Earth, and the Earth keeps rotating to produce a difference between day and night.

6. When the three are lined up in a straight line, there will be a solar or lunar eclipse.

7. When the moon blocks the sunlight from reaching the earth in the middle, there is a solar eclipse.

8. A lunar eclipse occurs when the earth blocks the sunlight from shining on the moon in the middle.

1 Two theories of planetary motion.

1) Geocentrism.

The exponents of geocentrism are Aristotle and Ptole Finch. From people's daily experience (the sun rises in the east and sets in the west), they put forward the geocentric theory that the earth is the center of the universe and is stationary, and that all the planets move in a circle around the earth.

Geocentrism is more in line with people's experience and religious theological ideas at that time, and has become a theological creed and has been believed by people for more than a thousand years, but the celestial movements it describes are not only complex but also very different from the actual calendar based on it.

2) Heliocentrism.

The representative of heliocentrism is Copernicus, who made a specific exposition and mathematical argument on heliocentrism in his book "Theory of the Movement of Celestial Bodies". It is believed that the sun is stationary and that the earth and other planets move around the sun. Moved the Earth from the center of celestial motion to the position of an ordinary planet.

The description of planetary motion appears simpler and more scientific. Heliocentrism liberated science from theology, overcame geocentrism, and gradually became accepted.

However, Copernicus adhered to the traditional idea that the nucleus of the celestial body should move in a uniform circular motion, and pursued the harmony and beauty of numbers, and his model of the motion of the celestial bodies lacked in-depth physical thinking, and was actually a mathematical model.

According to the certainty and non-lack of certainty of the occurrence of events, it can be seen that the earth must revolve around the right sun, and the posture is blind to the objective law, and the traces and disadvantages are inevitable events in the definite events;

Therefore, the selection: a Bu Nucleus.

It's the gravitational force that Newton discovered.

This attraction exists between any two objects. This attraction between objects is prevalent between all things in the universe and is called gravitational force.

Gravitation is an interaction between objects due to the mass they have. Its size is related to the mass of the object and the distance between the two objects. The greater the mass of the object, the greater the gravitational pull between them; The farther apart the objects, the less gravitational pull there is between them.

The reality is that the Earth and the Sun move together around their common centroid point. Since this common centroid point is located on the sun, humans only observe the movement of the earth around the "sun, that is, the center of mass at the sun", and cannot see the movement of the sun around the mass point at the sun (since this mass point is not in the center of the sun, the sun also has a small precessional motion) - a small precession.

Of course, modern scientists have observed and calculated this movement of the sun.

As for why it rotates, it is generally believed that in order to maintain a stable orbit (without hitting the Sun), a centrifugal force opposite to the centripetal force (gravitational force) is required, so that the planet or (natural) satellite will move in a circular motion (including an ellipse).

Newton's law of universal gravitation. The gravitational force between the Earth and the Sun provides the centripetal force to make it move in a circular motion....

From the question, it can be seen that the subject's idea is somewhat biased.

The title reads that "the earth revolves around the sun by centripetal force", however, this description is wrong. Newton's laws express that force is not what maintains the motion of an object, but what changes it.

After all, centripetal force is a virtual force, and this word is easy to misunderstand, and the following is replaced by gravitational force. It's not gravity that makes the Earth revolve around the Sun, it's gravity that pulls the Earth toward the Sun, and it does work.

As shown in the figure, the Earth-Sun distance is r. For a period of time, the earth was indeed pulled towards the sun because of the influence of the sun's gravity, and it fell by a distance h relative to the sun, and if the earth had no speed, it would undoubtedly fall into the sun.

Fortunately, the earth has a velocity v, and during this time, although the earth cannot avoid falling towards the sun, it runs at a certain angle to the side of the sun with its flexible body, so that the distance between itself and the sun is still r and does not become smaller.

The earth is falling towards the sun all the time, but it is also using its speed to dodge all the time, so as to keep its distance from the sun constant.

The equilibrium between the earth and the sun is achieved by the centroid of gravity and circular motion, and the current regular motion is caused by this principle, and space flights and satellites rely on this principle. If one day the earth slows down, it is possible that it will get closer to the sun step by step.

Because the earth's orbit has its own orbit, it is very perfect, it becomes a circular arc, so it will only keep moving according to that arc, and there is no such thing as him getting close to the sun in that orbit at that time, so he will not be close to the sun.

In addition to the centripetal force of the earth pointing towards the sun, there is also a centrifugal force in the tangential direction of movement, and the resultant force is the elliptical Earth-Sun orbit. Just like a spinning top, there is only centrifugal force, and it will move along a rotating parabola without horizontal centripetal force. In addition to the centripetal force of the earth pointing towards the sun, there is also a centrifugal force in the tangential direction of movement, and the resultant force is the elliptical Earth-Sun orbit.

Just like a spinning top, there is only centrifugal force, and it will move along a rotating parabola without horizontal centripetal force. In addition to the centripetal force of the earth pointing towards the sun, there is also a centrifugal force in the tangential direction of movement, and the resultant force is the elliptical Earth-Sun orbit. Just like a spinning top, there is only centrifugal force, and it will move along a rotating parabola without horizontal centripetal force.

A simple sentence to explain this phenomenon is: velocity, the speed that just reaches the equilibrium distance, and if the speed is fast, it is thrown out of the solar system, and if the speed is slow, it will merge with the sun.

The temperature around the sun is more than 1,000 degrees, and even people can roast it, let alone the earth.

Each of them has its own orbit, and if they deviate from it, the Earth will be destroyed. So no matter how close it is, it can't be close.

Because in addition to the centripetal force, there is also a centrifugal force.

Yes, it's just that the process is slow.

According to. The common sense of life is a vain.

This is a sick sentence, logical error, "no one can deny" double negative table affirmation, followed by "not around the earth....Coupled with the affirmative and negative connotations above, the meaning of the whole sentence is that "no one can pretend to believe that the earth revolves around the sun" is obviously a false statement.

Correction: No one can deny that the earth orbits the sun.

In the original sentence "no one can deny that the earth is a broad sail orbiting the sun", the double negative expression of "cannot be denied" is affirmative, so it is changed to affirm that the noisy sentence should be a liter eggplant:

Everyone is sure that the earth revolves around the sun.

Sometimes, in order to change the sentence without changing the meaning of the sentence and to make the sentence smooth, the words can be cut appropriately.