Why doesn t the position of the North Star change?

This is because the position of the North Star is relatively fixed, and the position of the North Star and the Earth is also mutual, so it will never change.

This is just a matter of our perspective, in fact, it is also moving, but the law of motion is unchanging from the perspective of the earth.

Actually, it's not because the position of the North Star doesn't change, but because we stand on Earth and observe. Because the Earth is dense enough to maintain a very round outline under the centrifugal force of rotation, and the gravitational pull of the sun and the moon creates too little change in the axis of rotation, so that human life for decades has not seen any change in the position of the North Pole.

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Because the Earth rotates around the Earth's axis, and Polaris is on the northern extension of the Earth's axis, we can only indicate the north when we look at the sky at night, when the North Star is still and is northerly overhead.

And because the direction of the tilt of the Earth's axis remains unchanged throughout the year, and the distance between Polaris and the Earth is much greater than the radius of the Earth's revolution, the Earth's rotation is negligible.

Strictly speaking, the North Star is not permanent due to precession, and it cycles every 2,000 years. In Magellan's voyages, the North Star was about 8 degrees away from the North Celestial Pole, but now, the North Star is closer to the North Celestial Pole, with an angle difference of only 40 points. This is almost negligible.

The North Star is a very important indicator of field activities and ancient navigation directions, and since it always represents the direction of due north, you can use the North Star to judge the direction when you get lost in the wild.

Five times the secret of the North Star "not moving".

Polaris. It seems that the bend and light do not move because the physical force is relatively static. In the universe, the North Star forms a conical shape with the orbit of the Earth's ecliptic plane and the Earth's revolution, and when the Earth's tooling is buried wide, the vision formed by the North Star and the Earth is the same and equal, which makes people on the Earth look at the North Star and feel that the North Star is not moving.

Polaris, also known as the North Star and the Purple Microstar, refers to a star closest to the North Celestial Pole.

Polaris is located at the northern end of the Earth's axis, on the Big Dipper.

A five-fold extension of the Celestial Swirl and Celestial Pivot in the line. Due to the rotation of the Earth, and Polaris is on the axis of rotation of the celestial sphere, it is stationary relative to other stars. Polaris is located about 433 light-years from Earth and has a diameter of about 52 million kilometers.

Polaris has always been a reference for people to point out the direction, when you can't find the direction, you can identify the direction by finding the Polaris, the celestial bodies in the universe are constantly moving, and the revolution determines their distance, but why does Polaris not move?

First of all, we need to know that the North Star is not exactly at the North Pole, but has a certain deviation and is fixed for a long time, because the North Star is not the name of a star, but a pronoun. It's like the throne is always there, but the emperor can be anyone. In other words, whoever is closest to the North Pole is the North Star, the North Star we see now is called Gou Chenyi, 5,000 years ago sitting in the position of the North Pole Xiaochong Star is the Alpha of the constellation Draco, and in 14,000 A.D. will be taken by Vega.

This change is due to the fact that the Earth's axis "oscillates" slowly and regularly to a distant star, and it takes about 26,000 years to "swing" in one circle, during which time the star to which the Earth's axis points becomes our North Star.

There are more than 30 stars in the shortlist of Polaris, and they work in shifts about 1,000 years, with a full cycle of 25,700 years. Although the solar system orbits the Milky Way, it has a certain impact on the position of the North Star, but this impact is too small for the earth, because the solar system orbits the Milky Way for more than 200 million years, during which the changes of the major stars are actually very slow, and they will move a little bit over thousands of years, so even if the position of the North Star has changed slightly, we can't see it with the naked eye at all. The concept of "sidereal day" is a very accurate astronomical calendar invented by the ancient ancestors of our country, and the North Star is just a concept star proposed by the study of astronomy, which pins on the beautiful hopes of the ancients and the natural worship of the ancient stars.

In modern times, the North Star has become an important guide for people's outdoor activities, and it has also provided convenience for stargazing activities, and Kant once said a sentence that has been praised by countless people: "There are two things, the more often and persistently people contemplate them, the more they fill their hearts with ever-new and ever-increasing wonder and awe: the starry sky above me and the moral law in my heart."

It can be seen that looking up at the starry sky from time to time, facing the vast starry sky can often bring some thoughts and insights about life.

Ningxia is located in the geometric center of China's land and Xinjiang, the transportation is convenient and easy to reach, nearly 300 days of fine weather throughout the year, almost every day can be stargazing, is one of the best stargazing places, so Ningxia is also known as the "hometown of the stars", Ningxia Liupan Mountain, Helan Mountain, inside and outside the Great Wall, on both sides of the Yellow River, are good places for stargazing.

The reason Polaris doesn't move is that the Earth rotates around the Earth's axis, and Polaris is on the northern extension of the Earth's axis, so it is northerly overhead, indicating the north. The North Star is the star closest to the North Celestial Pole.

Polaris is located about 433 light-years from Earth and has a diameter of about 52 million kilometers. Polaris is not completely dry and dusty, and it is in the positive position of the North Celestial Pole, in fact, it rotates at a very slow speed, and it does not change compared to other stars.

<> the north end of the Earth's axis always points to the vicinity of the North Pole Huihe, so the North Star is always in the north when the Earth rotates. Polaris is located at the northern end of the Earth's axis, on a five-fold extension of the line between Sky Swirl and Celestial Pivot in the Big Dipper. Due to the rotation of the earth, the North Pole Qibi is located on the axis of the celestial sphere's rotation, and is stationary and quiet compared to other stars.

Polaris is located about 433 light-years from Earth and has a diameter of about 52 million kilometers.