definition of Pole Star
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A pole star or polar star is a star, preferably bright, closely aligned to the axis of rotation of an astronomical object. ... A couple thousand years ago, Kochab and Pherkad were twin northern pole stars, though neither was as close to the pole as Polaris is now.
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Pole star:- The star which always shines over the north pole does not changes it positions in known as pole star, indicating the north direction.
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