The North Star, aka Polaris<\/h3>\n
The North Star, also known as Polaris, appears to stay fixed in our northern sky. It marks the location of the sky\u2019s north pole, or the north celestial pole, the point around which the whole northern sky \u2013 full of stars \u2013 turns. That\u2019s why you can always use Polaris to find the direction north.<\/p>\n
Even though the North Star doesn\u2019t appear to move, it does<\/em> move. The North Star is a symbol for constancy. But, a video of it overnight, reveals that it makes its own little circle around the sky\u2019s north pole every day. That\u2019s because the North Star is offset a little \u2013 by about 0.65 degrees \u2013 from celestial north. So, Polaris makes a circle that\u2019s 1.3 degrees in diameter each day. When it\u2019s closest to the celestial pole in about 100 years, at a distance of only 0.45 degrees, it\u2019ll make a daily circle of only 0.90 degrees.<\/p>\n Where does this movement \u2013 or in Polaris\u2019 case, lack of movement \u2013 come from? It comes from Earth\u2019s spin. Earth spins under the sky once a day, and our spin causes the sun in the daytime \u2013 and the stars at night \u2013 to rise in the east and set in the west. But the North Star is a special case. Because it lies almost exactly above Earth\u2019s northern axis, it\u2019s like the hub of a wheel. It doesn\u2019t rise or set. Instead, it appears to stay put in the northern sky.<\/p>\n The North Star not only points toward the north, but its height in the northern sky also matches your latitude on earth. If you are sailing the Caribbean at 16\u00b0 north latitude, the north star will be about 16\u00b0 high in your sky. If you are sailing around Nova Scotia, at 44\u00b0 north latitude, then the North Star will be about 44\u00b0 high in your northern sky. Each degree north or south equals 69 miles (111 km), so traveling 690 miles north or south will change your latitude, and the North Star\u2019s elevation, by 10 degrees.<\/p>\n Read more: Polaris is the North Star<\/p>\n A motion of Earth called precession causes our axis to trace out an imaginary circle on the celestial sphere every 26,000 years. Thousands of years ago, when the pyramids were rising from the sands of ancient Egypt, the North Star was an inconspicuous star called Thuban in the constellation Draco the Dragon. Twelve thousand years from now, the blue-white star Vega in the constellation Lyra the Harp will be a much brighter North Star than our current Polaris.<\/p>\n Polaris could be a name for any<\/em> North Star. Our current Polaris used to be called Phoenice. It is the 49th brightest star in the sky. It is not known for its brightness, but for its unique position in the sky.<\/p>\n By the way, Polaris \u2013 like all stars \u2013 has more than one kind of motion. The stars we see in our night sky are all members of our Milky Way galaxy. All of these stars are moving through space, but they\u2019re so far away we can\u2019t easily see them move relative to each other. That\u2019s why the stars appear fixed relative to each other. And it\u2019s why, for the most part, we see the same constellations as our ancestors.<\/p>\n But over time, this movement, called proper motion<\/em> rearranges the patterns of stars we see in our sky. For Polaris, that movement is small, about 46 arcseconds in 1,000 years. That is about 1\/40th of the diameter of the full moon as seen from the earth. So when you\u2019re talking about stars moving<\/em> or staying fixed<\/em>, remember \u2026 they are all moving through the vastness of space. It\u2019s just the relatively short time of a human lifespan that prevents us from seeing this grand motion.<\/p>\n Enjoying EarthSky? Sign up for our free daily newsletter today!<\/p>\n Bottom line: The North Star is a symbol for constancy. But, a video of it overnight, reveals that it makes its own little circle around the sky\u2019s north pole every day.<\/p>\n <\/div>\n![\"Myriad](\"https:\/\/earthsky.org\/upl\/2023\/08\/Perseid-meteor-Radu-Anghel-Romania-aug13-2023-e1692035061492.jpg\")
How high in your sky?<\/h3>\n
![\"Star](\"https:\/\/earthsky.org\/upl\/2017\/06\/Precession-Map-from-Wikipedia.jpg\")
Taking turns as the North Star<\/h3>\n
Proper motion<\/h3>\n