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Polaris

Polaris is Earth's current northern pole star, and thus is commonly referred to as the North Star. Historically, Polaris was used by sailors and navigators to determine their current latitude while crossing oceans. Please place all questions about Polaris, the brightest star in the constellation Ursa Minor, into this category.

543 Questions

What is size of polaris star?

Polaris is a yellow super-giant with two smaller companions, Polaris Aa has a radius which is 46 +/- 3 times the Sun's radius.

Why is Polaris useful for navigation?

It is useful because it is directly above Earth's north pole so if you were traveling north, you would know what to follow

How many stars are in the constellation Polaris?

Polaris is not a constellation but it is the brightest star in the constellation Ursa Minor, the Little Bear. Polaris is not a single star just like half of all known stars are not single stars like our sun but are normally in a system of two or more stars. Polaris is part of a system that is four stars. It's closest companion known as Polaris Ab is easy to see in a small telescope.

Is Polaris hotter than the Sun?

Yes. The sun is about 5778°K. Polaris is about 6900°K.

Why is polaris the brightest star?

The question cannot be answered because it is based on a false premise that Polaris is the brightest star.

If you measure polaris at an altitude of 60 degrees where are you on earth?

If Polaris appears 60° above the northern horizon, then you are pretty near 60° north latitude.

If you're on the equator ... 0° north latitude ... then Polaris is on the horizon ... 0° altitude.

If you're at the north pole ... 90° north latitude ... then Polaris is over your head ... 90° altitude.

The altitude above the northern horizon at which Polaris appears is nearly identical to your north latitude.

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The difference (error) between Polaris and the real North Celestial Pole is about 0.7 degree. Not

good enough for precise navigation or surveying, but just fine for directions when you're hiking.

How far Polaris appears above the horizon depends on?

How far Polaris appears above the horizon depends on your latitude in the Northern Hemisphere. The closer you are to the North Pole, the higher Polaris will appear in the sky, reaching nearly 90 degrees at the pole itself. Conversely, as you move toward the equator, Polaris will appear closer to the horizon, disappearing entirely for observers in the Southern Hemisphere. Thus, your geographic position determines the elevation of Polaris in your local sky.

Which is more reliable method for a sailor to determine noth by using the star Polaris or reading afoad map?

A map doesn't tell you which way is north, it tells you which direction to go to get somewhere assuming you already KNOW which way is north... so it's not really an option except in special cases (for example, if a map shows two landmarks that are visible from the sailor's current position, he can use that to determine both where he is on the map and which direction is north).

Does Polaris move when you move on earth?

Yes ! The Polaris Moves Comparatively To Earth !The Position Of The Polaris Is Not Constant .

The meeting point of Polaris and southern cross?

The meeting point of Polaris (the North Star) and the Southern Cross is at the celestial south pole. This point in the sky is directly opposite the Earth's geographic north pole and cannot be seen from the Southern Hemisphere. Observers in the Northern Hemisphere can use Polaris as a guide to locate the North Star, while in the Southern Hemisphere, the Southern Cross is a prominent constellation used for navigation.

Which part of America can see Polaris at night?

You can see it from anywhere in North America, and the parts of South America that are north of the equator.

What star is considered fixed star?

All the visible stars are considered fixed stars to distinguish them from the planets that wander round among the fixed stars.

Some nearby stars appear to move very slowly with what is called 'proper motion'; but it takes thousands of years for the shapes of the constellations to change even slightly.

When is the best season to see polaris?

If you are north of the Tropic of Capricorn, winter. The Earth is then tilted in a way that Polaris is in the darkest part of the sky that it can be in. It also can be seen from further south than any other time of year, so in some places, winter is the only season to see Polaris. If you are south of the Tropic of Capricorn, you will not see Polaris no matter what season it is.

Can you see Polaris all year long?

it depends if you can find the big dipper and little dipper then you can always find the north star