Why hasn't the position of the North Pole star changed?

When we get lost in the wild, we have to use a compass and a modern mobile phone to tell the direction. The ancients used Polaris to identify the direction, which is the most primitive way to determine the direction. As long as the celestial bodies in the universe will change, that is, the celestial bodies in the universe are constantly moving, whether it is revolution or rotation.

However, in the historical records of mankind, we can know that the position of the North Pole star is fixed and will not change. So what is the reason for the fixation?

In fact, Polaris does not coincide with the North Pole. Its position is a little off, and it is not the real North Pole. Polaris is a general term for a position, and it has always been fixed in the same position, because Polaris does not represent the name of a star. In other words, Polaris is the closest star to the North Pole of the Earth. In fact, Polaris only remains unchanged for thousands of years, not forever.

The declination of the earth's axis is also the reason for spring, summer, autumn and winter. But this declination is like a gyro swinging slowly, so the North Pole will move slowly, and finally a star closer to the north will replace it. But the north direction of the earth is always perpendicular to the north direction of the sun (approximately), and the north direction of the sun is perpendicular to the outside of the Milky Way, where there are few stars, and the north direction of the earth is still in the Milky Way, where there are many stars, but the sun has turned for 260 million years, and there will probably be tens of thousands of Polaris on the earth.

Our ancient sages had accurate documents five thousand years ago, such as the precession in the calendar, the book of Hutuluo and the reflection in Taiji. These are the wisdom left by the ancients, the code to explain the laws of the universe, and the digital cosmology. Sadly, why can't we read the Book of Changes left by our ancestors? It is the source of China civilization. Open the ice, from drilling to writing, lamenting that Chinese civilization has dominated the world civilization for five years. Therefore, in this era of underdeveloped traffic, smart ancestors will use Polaris to identify the direction in the forest and reach the place they want to go.

Some people say that the problem that the North Pole is not the same as the North Pole of the earth may be related to the moon. Earth-moon system is a whole, but the magnetic poles of the earth and the moon are the same, and the same sex repels each other, so the North Pole and the North Pole are a little different. This is only the opinion of some people, and the specific situation remains to be studied.

There is another question: which is farther away, Polaris or the Milky Way? At present, it is thought that Polaris is more than 400 light-years away from the earth, which is only my own opinion, and it is still far from100000 light-years. In addition, the thickness of the Milky Way should also be calculated, which is about 400 light years.

The key point is that Polaris is in our sight, the Polaris system is very large, and the Big Dipper is also its satellite. Just the Big Dipper shows the disk of Polaris, and the disk of the solar system is 90 degrees from the disk of Polaris system. The magnetic force of Polaris gives the axis of rotation of the earth and other planets in the solar system, and changes in the four seasons of the earth, so that life on the earth can evolve and human civilization can develop.

Polaris is too far away from the sun, so that the distance that the earth moves for several years is too small. The above is the explanation about why Polaris doesn't move. The research on Polaris will continue in the future, and I believe that people in the future will have more understanding and mastery of Polaris.