Because it lies nearly in a direct line with the axis of the Earth's rotation "above" the North Pole, Polaris is apparently motionless from the Earth, and all the stars of the Northern sky appear to rotate around it. Therefore, it makes an excellent fixed point from which to draw measurements for [celestial navigation]?.
Due to various wobbles and wanderings in the Earth's orbit and rotation, other stars in the Northern hemisphere have been and will likely again become the North star over thousands of years.
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