Is Polaris really not moving?

Polaris is not static, in fact, it's just that subtle changes can't be observed with the naked eye. The position of Polaris in the sky always seems to be motionless in the north, and it feels that the earth axis always points to Polaris.

Because the earth rotates around the earth axis, and Polaris is very close to the north extension line of the earth axis, Polaris is almost motionless in the sky at night, with its head tilted to the north, so it can indicate the north.

Although the tilt direction of the earth's axis will change because the earth revolves around the sun all year round, the distance between Polaris and the earth is much larger than the radius of the earth's revolution, so the change of the earth's axis caused by the earth's revolution can be ignored.

Extended data:

?

The function of Polaris and its search method

Polaris is a very important indicator of field activities and the direction of ancient navigation, and it is also a constellation small enough to be able to tell the direction of stargazing, which plays a very important role in the accurate positioning of the astrophotography and the equatorial observatory in the observation room. Because Polaris is closest to true north, people on earth have been relying on Polaris for navigation for thousands of years.

To find the North Star, you usually look for the Big Dipper first, and then find the North Star through the Big Dipper. The Big Dipper is a part of Ursa major. Graphically, the Big Dipper is located at the back and tail of Ursa Major. Of these seven stars, six are secondary stars and one is tertiary. Through the connection of two stars (Shu Tian and Tian Xuan) in Doukou, Polaris was discovered after extending in the direction of Doukou for about five times.

Phoenix Net-It turns out that Polaris doesn't mean that one star and several big stars take turns to do it.

Baidu Encyclopedia-Polaris (the nearest star to the North Pole)?