Why The Polaris Star Seems To Be Stationary In The Sky, Even With The Earth Moving Around The Sun, And The Sun Around The Galaxy’s Center
<p>If you sit in a swivel office chair, put it around, and look at the ceiling, you will see that a spot just above your head will be fixed. It is the same with Polaris.<em> It is just a coincidence </em>that it is there, on our axis of rotation.</p>
<p>The movement that gives this illusion, as I said, is the EARTH’S ROTATION, the turn that the Earth takes in itself daily. The two movements mentioned in the title of this article do not affect this impression. First, because the Polar star is very distant from Earth, approximately 450 light-years away. So our orbit’s radius (the longest distance we travel around the sun) makes no noticeable difference in perspective from Polaris. Second, because the sun’s orbit velocity around the center of the galaxy is very, very slow. To take a full tour of the galaxy, it takes 235 to 250 million years! This means that, yes, the sun is moving through the galaxy and that, yes, Polaris is also moving through the galaxy — in the same direction as the sun — but the speed with which this happens and the distance that separate the stars make these movements imperceptible for us, human beings.</p>
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