High Score Bounty The Earth is constantly revolving, why does the Earth s axis still point to the No

From the meaning of lz, the "absolute" pointing of the Earth's axis cannot of course always point in the same direction. It's just that because Polaris is so far away from the Earth, the radius of the Earth's orbit (although elliptical, the radius changes) is so small that it is almost negligible compared to the distance from the Earth to the North Star. Therefore, the position of the North Star does not change for the Earth, and the Earth's axis always points to the North Star.

It is true that the direction of the Earth's axis is constantly changing, but this change is very small. It seems that every 25,000 years, the Earth's axis rotates like a spinning top. This is called precession.

You should have learned geography, the earth's axis does not move when it revolves, and you may not have figured out how the ball rotates. If there is no rotation, the earth is translational, do you know what translational means? That is, all the particles travel the same distance.

Therefore, the earth's axis is not moving, and the rotation of the earth's axis will not move, because the rotation does not affect the earth's axis.

We look at the moon at night, and the moon follows me as I walk, but in fact, the moon does not move.

The orbital radius of the Earth's revolution is too small relative to the distance from Polaris to Earth, and the change in angle is negligible, so the Earth's axis always points to Polaris as it rotates.

Because the Earth's axis is "tilted"! You look at the globe.

If the landlord wants to be more serious, of course, the earth's axis will not point to the North Star accurately, because the position of the earth will change when it rotates.

In fact, there is a "triangulation method" that uses this small angular change in rotation to measure the distance from a star to the solar system.

However, this change is not visible to the naked eye alone, and when it comes to identifying direction, the deviation of direction due to the seasons is negligible, and it can be approximated that the Earth's axis is always pointing towards the North Star.

The reason why this change is small is that Polaris is very far away from us, and although the radius of the Earth's revolution is also large, it is still too small compared to the distance from Polaris.

There are a few intuitive examples. For example, we will find that the moon seems to move with the movement of people, or the mountains in the distance will follow us, and this is the same thing.

The revolution of the Earth refers to the movement of the Earth around the Sun, and it takes about a day (a year) to complete a week. In this process, the Earth's axis remains steady and points in the direction of Polaris. Polaris happens to be on the extension of the Earth's axis, so it looks like it's always above the Earth's axis.

This phenomenon is caused by the tilt of the Earth's axis. The rotation and revolution of the earth are not in the same plane, but are inclined to each other by degrees. As a result, as the Earth rotates, the sun spots and the constellations in the night sky change in different seasons.

But no matter what the season, the Earth's axis always points in the direction of the North Star.

In conclusion, the reason why Polaris is always above the Earth's axis is due to its relationship to a specific position of the Earth's axis in space, and has nothing to do with the Earth's revolution.

In a certain period of time, the inner axis is always pointing to the North Star, but everything is constantly moving, the slow change of the earth's axis itself, and the position of the North Star itself in the universe is also changing rapidly, but the relative position of the earth is negligible.

The central axis of the earth is called the axis of the earth, and it is tilted, and the direction of the axis of the earth is always towards the North Star, when the earth revolves, the direction of the axis of the earth has not changed, and the North Pole always points to the position near the North Star. However, since its axis of rotation always remains in the same direction, it appears that the north celestial pole remains in place. After the time bench was towned, astronomers found that the direction of the Earth's axis was slowly changing, and the North Celestial Pole was also moving slowly, and the current North Star was not near the North Celestial Pole.

According to astronomers, 12000

In a certain period of time, the axis of the earth will always point to the North Star, but everything is constantly moving, the slow change of the earth's axis itself, and the position of the North Star itself in the universe is also changing rapidly, but the relative position of the earth is very small.

The central axis of the earth is called the axis of the earth, and it is oblique, and the direction of the axis of the earth is always towards the north star, when the earth rotates, the direction of the axis of the earth has not changed, and the north pole always points to the position near the north star. But since its axis of rotation always remains in the same direction, it appears that the North Celestial Pole also remains in place. After a long time, astronomers found that the direction of the Earth's axis was slowly changing, and the North Celestial Pole was also moving slowly, and the current North Star was not near the North Celestial Pole.

According to astronomers, 12000

It is impossible to remain motionless, because after all, the Earth still revolves around the Sun, and the Sun revolves around the center of the Milky Way, but the crux of the matter is not here (because the distance change caused by the Earth's revolution is negligible, and the Sun's orbit cycle is more than 200 million years, which is too long to consider).

Therefore, the immediate answer to this question is that the position of the North Star is near the North Celestial Pole, and the North Celestial Pole is an artificially prescribed point.

Because of the rotation of the earth, it can be assumed that the Earth's axis of rotation can be extended indefinitely, and the North Celestial Pole is a fixed point at infinity where the axis of rotation that extends infinitely from the side of the Northern Hemisphere).

Because the position of the North Celestial Pole is fixed relative to humans on the ground, the definition of the North Star is a bright star near the North Celestial Pole. So Polaris feels like it's just not moving.

But as I said earlier, Polaris is a star near the North Celestial Pole, which means that Polaris is not fixed to a star, but is replaced.

The reason is due to the precession of the earth, that is, the axis of rotation is rotating around the yellow axis (the yellow axis is an imaginary axis perpendicular to the ecliptic plane), since the direction of the axis of rotation is changing high, then the North Star will naturally change with it.

The current North Star is called Gou Chenyi, and about 12,000 years from now, the new North Star will be Vega.

Looking forward to your comments and attention!

The North Star is in motion. It's too far away.

Currently, the Earth's axis of rotation passes through the North Star.

The position of the North Celestial Pole is relative to us on the road, and the North Star is understood to be a bright star around the North Celestial Pole. Therefore, the North Star gives the impression that it has never moved its position. But as I just said, Polaris is a star around the North Celestial Pole, and the sound of the strings is changed to Polaris is not fixed and does not move to one star, but alternates.

The reason for this is due to the world's nucleus aging, that is, the axis of rotation rotating around the yellow axis (the yellow axis is an illusion axis of perpendicular bisecting the ecliptic plane).

Even if the axis of rotation is changing, then the North Star needs to follow suit. The earth revolves through the sun and rotates at a constant speed, which is closely around an imaginary axis that cannot be seen across the center of the earth, that is, it rotates like a ball pierced by chopsticks, and the two sides of this invisible axis are called the north and south poles. The vast cosmic space encompasses the earth, and the starry sky on the earth is like a ball, and people call this sky inlaid with stars the celestial sphere, which accompanies the rotation of the earth.

The celestial sphere seems to revolve around the earth, so the daily stars seem to rise and set in the west, like daylight. Then one should have a definition, the earth is rotating at a uniform speed, and the celestial sphere of relativity looks like it revolves around the earth, but what about the two sides of the earth? Isn't the extension line of the two poles that deviates from the axis of the heavenly sphere also the axis of the celestial sphere, and how the earth turns another axis seems to be unchanged, so the star that is biased does not seem to move.

In that case, it is impossible to have a star in the sky, which seems to be biased by the axis of rotation, and all the planets in this circular net are qualified to be the North Star, so the North Star does not refer to a single star, but the stars in this circular net take turns to govern. Because the stars are not densely packed on the circular net here, it is very likely that a star will be on duty for many years, or even thousands of years, and with the precession of the earth's axis every year, the polaris that is biased will also be offsetTherefore, it is not easy to be very precise in the air of the axis of rotation, but "basically pointing".

It is impossible to remain motionless, because after all, the earth still revolves around the sun, and the sun still revolves around the center of the Milky Way, but the crux of the problem is not here (because the distance caused by the revolution of the earth is very small and negligible, and the cycle of the sun's revolution is more than 200 million years, and the time is too long to be considered).

I think of course it's movement, because the position of the North Star is different from what is observed throughout the year.

It depends on where you are looking at it from on the earth. On earth, look at the heavens from south to north. Northern Hemisphere.

The stars are from east to west. It's counterclockwise.

For example, if you stand in Zhejiang, you will turn counterclockwise. Because most of the stars still seem to rise in the east and set in the west. But when observing the starry sky on Earth, it is counterclockwise and clockwise.

It's also relative. It's like if you look at the sun with your head facing south, it moves clockwise throughout the day. If your head is facing north, you will feel that the sun is moving counterclockwise. In the Northern Hemisphere, the starry sky seems to surround the North Star.

Revolve. And in the Southern Hemisphere, the stars seem to revolve around the southern celestial pole.

Summary. Dear, I'm glad to answer for you, throughout the day, the position of the North Star is basically unchanged, indicating that the Earth's rotation characteristics have Polaris close enough to the Earth's North Axis, so the radius of the North Star's apparent motion on the celestial sphere caused by the Earth's rotation is very small, which can be approximately regarded as stationary, the position of the North Star is on the extension line of the Earth's axis of rotation, and the stars around it are observed on the Earth to rotate around it, but in fact, the position of the stars around it is fixed, so the counterproof is that the Earth is rotating.

The position of the North Star remains largely unchanged throughout the day, indicating what is characteristic of the Earth's rotation.

Why is it so slow.

Dear, I'm glad to answer for you, one day late, the position of the North Star is basically unchanged, indicating that the Earth's rotation characteristics have the North Pole before the star is close enough to the Earth's North Axis, so the radius of the North Star's apparent motion in the celestial sphere caused by the Earth's rotation is very small, which can be approximately regarded as stationary, the position of the North Star is on the extension line of the Earth's axis of rotation, and the stars around it are observed to rotate around it on the Earth, but in fact, the position of the stars around it is fixed. So the counter-proof is that the earth is rotating.

Dear, the rotation characteristics of the earth The rotation of the earth around the axis of the earth, the spatial position of the axis of the earth is basically stable, its north end always points to the vicinity of the North Star, the direction of the earth's rotation is from west to east, rotation refers to the movement of the object to rotate on its own, the object will rotate along an axis that passes through the object itself, the axis of rotation is called the axis of rotation, the axis of rotation will pass through the center of mass of the celestial body, the rotation of the earth is a circular motion of the earth along an axis through the center of the earth.