What does the Earth look like on the North Star, what does our telescope look like on the North Star

Polaris is a star, and it emits much more light than it does from Earth (the light emitted by nuclear fusion at that time). So even if you can stay on the North Star (not be roasted), you can't see the Earth (in fact, you can't see any stars), but there is a dazzling light (you can be blind).

Similarly, you can watch the sky near the street lamp at night, even if the sky is clear and there is no moon, you still can't see the stars. But once you move away from the street lights, you can see the stars. That's because the brightness of the background exceeds the brightness of the incident light.

So people who look at the starry sky go back to the suburbs where there is no urban lighting system. There is no background light there.

And it is estimated that the light reflected by the earth has not yet reached the North Star, and it is drowned in the cosmic background microwave, so it is even more invisible.

Looking at the North Star through a telescope? It's the same as looking at other stars. No different from the sun (except for the size).

Ordinary astronomical telescopes look at Polaris as a small dot, and using radio astronomical telescopes to observe can analyze some spectral characteristics of Polaris, and then we can deduce its visual characteristics.

Looking at the earth from the North Star, you need to add an assumption, that is, there is a planet revolving around the North Star, and if you set up an astronomical telescope on it to observe, as long as the orientation is correct, you should be able to see our sun, but it is too difficult to observe the earth, because the reflection of the earth is completely hidden in the sun's brilliance, just like the noon sun and the glimmer of fireflies, only when the earth transits the sun, it can only be calculated according to the slight changes in the luminosity of the sun, but this is also a very difficult and complicated thingGenerally speaking, Jupiter and Saturn are relatively large in size and mass, so it is easy to calculate first.

Located in the constellation Ursa Minor, about 430 light-years from Earth, Polaris is the brightest and most stable star visible in the night sky. Due to Polaris' closest position to due north, people on Earth have relied on its starlight to navigate for thousands of years.

Polaris is a bright star in the north of the earth, very close to the north pole of the earth, almost facing the earth's axis, from the earth, its position is almost unchanged, you can rely on the car to discern the direction. Due to precession, Polaris is not a permanent star, it is now the constellation Ursa Minor, and by 14,000 A.D. it will be Vega.

In the northern sky. Visibility is generally not bad. The brightest one.

Polaris is in the whole place.

Come to China can be seen, bit source.

In the northern sky, it can now be found through the Big Dipper in the constellation Ursa Major The Big Dipper is visible in the north after dusk, and you can see a spoon-shaped 7 planets, that is the famous Big Dipper, which is easy to see with the naked eye, because the Big Dipper is spectacular, extending the two stars of the spoon mouth Tianshu and Tianxuan by five times, and you can also find the North Star, the North Star is not very bright, just a star of more than two points.

Hope it helps.

It is always visible in areas north of the equator. It is located in the constellation Ursa Minor, right ascension 02h 31m and declination +89° 15 51, which is probably due north.

This is a good question, and there are two reasons for this question: the first is that the problem is not dealt with mathematically, and the second is the lack of basic knowledge of astronomy.

Let's start with a concept, which is the so-called "second gap". This is a unit of celestial distance, which is approximately equal to light-years or trillions of kilometers. A parsec is defined as the distance between a distant object and the Sun when the distance between the Sun and the Earth is 1 second.

It can be easily calculated by trigonometric functions, and the distance between the Sun and the Earth can be taken as 100 million kilometers.

The observation of parsecs is shown in the attached figure.

With that out of the way, we can go back to option d. Polaris (Ursa Minor) is about 400 light-years away from the Sun, or 123 parsecs. This data tells us that if we look at the Earth from Polaris, its angular distance changes by only 1 60 seconds when it is at the equinox and the equinox of its orbit (i.e., at the ends of the orbital diameter).

What kind of concept is this? It's the size of a $1 coin if you look at it from 315 kilometers away. To see such a small circle, you will need an astronomical telescope with an aperture of more than 1 meter and an extremely stable observatory foundation.

Because even the deviation caused by continental drift is enough to mask it. Of course, looking at the North Star from Earth, it also draws a circle of 1 60 seconds on the celestial sphere year after year, which is also a clue and evidence that astronomers have been able to measure its distance.

Knowing this data, can we understand why the Earth's axis is pointing precisely at Polaris and regardless of the Earth's revolution? In fact, this accuracy is also relative, the North Star itself is about 1 degree away from the real North Celestial Pole, which we cannot detect with the naked eye; The annual parallax of 216,000 years smaller than it is, of course, even more imperceptible.

This example once again gives us a sense of the vastness of space, doesn't it?

Your idea should be said to be correct in some ways.

The main reason for this topic is because of d. In this way, the rotation of the Earth does not bring about the visual movement of the North Star.

However, the Earth's revolution did not bring about the visual movement of Polaris, which is because Polaris is far away.

If you think about it, if there is no such reason, no matter how far away the North Star is, the Earth will rotate, and the North Star will rise in the east and set in the west, instead of almost stationary.

To give you the simplest explanation.

Suppose we can see infinitely, you are in a circle around your desk at home in Beijing, and there is a tree on the street in Guangzhou, and you circle around the table, in your eyes, the position of this tree is also relatively fixed.

At this point, you may ask, why not A?

Because when you turn, you are always facing the direction of that tree, just like the north end of the earth's axis points to the North Star, so this Guangzhou tree is the North Star, and the other trees are not.

Those who are not familiar with the stars can quickly find the North Star with the help of the Pole Finger Star.

The so-called "polar stars" are the two stars of the Big Dipper, Tianshu and Tianxuan. Their connection line is about 5 times longer in the direction of the mouth of the spoon formed by the Big Dipper, and the ruler ant can see the North Star.

In fact, the North Star is not difficult to find, it is very bright and eye-catching, and it is easy to find it if you are familiar with the starry sky.

It's easy to find the North Star through the Big Dipper in the constellation Ursa Major. Extending a certain distance along the bucket of the Big Dipper, you will have a very bright star, which is the North Star. Since Polaris is located almost exactly on the extended axis of the Earth's rotation, its position in the night sky remains largely unchanged, and it is often used by ancient people to identify directions at night.

Like many stars, Polaris is a multi-star system consisting of three stars: Polaris AA, Polaris AB, and Polaris B, which are located about 433 light-years from Earth. Polaris C and D were once thought to be part of the Polaris system, but later observations confirmed that they were not physically connected to this star system.