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What cause the north star to change between the stars vega polaris and thuban?
Wiki User
∙ 14y ago
The Earth is like an enormous gyroscope, spinning in space. We think of gyroscopes as always pointing in the same direction, but all gyros wobble a little bit, with a motion called "precession". The Earth's precession causes the north pole to move VERY SLOWLY. The north pole of the Earth is currently pointed to the star Polaris, but it hasn't always been, and won't always be. The cycle is 25,800 years long.
As the centuries pass, the Earth's precession will cause the north pole to slowly move away from Polaris, and in about 12,000 years will point somewhere near Vega. In another 14,000 years, the north pole will be pointed somewhere near Polaris again - except that Polaris itself is moving. In 26,000 years, Polaris will be about 5 degrees away from the pole.
Wiki User
∙ 14y ago
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