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Polaris, also known as Alpha Ursae Minoris, will become the North Star again in 27,800 AD. The cycle takes about 25,770 years to complete. Polaris is the current North Star. Polaris replaced Thuban around the first millennium BC. It will become closest to the celestial north pole around the year 2100 and start moving farther away. Gamma Cephei, also known as Airai, will replace Polaris around 3000, followed by Iota Cephei in 5200. Polaris will again become the Pole star in 27.800 after it finishes the 25,770 year cycle.
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The north star has very little apparent rotation in the night sky because?
The North Star, Polaris, is not EXACTLY over the north pole; it is about six-tenths of a degree off. The alignment is COMPLETELY coincidental, and temporary; 2000 years ago, the Earth was not aligned with Polaris, and in another 1000 years or so, the difference will again become noticeable. Because of the discrepancy, a time-exposure photo of Polaris will show it making TINY circles in the sky around the true north pole. There is no corresponding star above the south pole; nothing is even especially close.
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Volcano that is unlikely to erupt again?
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The changing position of the North Celestial Pole over a 26000 year period is due to the Earth's?
A axis of a gyroscope will "wobble" in a long, slow circle even as the gyro spins rapidly. This phenomenon is called "precession". The spinning Earth is like a gyroscope, and "wobbles" in a large circle due to precession. Right now, the north pole of the Earth's spin is pointed pretty close to the star Polaris. But over 26,000 years or so, the Earth's axis will follow an enormous circle from Polaris to Vega and back again. We're lucky we developed navigation when we did. 10,000 years ago, there was no "north star". In 5,000 years, there won't be one then, either.
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The north star has very little apparent rotation in the night sky because?
The North Star, Polaris, is not EXACTLY over the north pole; it is about six-tenths of a degree off. The alignment is COMPLETELY coincidental, and temporary; 2000 years ago, the Earth was not aligned with Polaris, and in another 1000 years or so, the difference will again become noticeable. Because of the discrepancy, a time-exposure photo of Polaris will show it making TINY circles in the sky around the true north pole. There is no corresponding star above the south pole; nothing is even especially close.
What cause the north star to change between the stars vega polaris and thuban?
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.
Why pole star is always seen on north?
It is purely coincidental that the north star Polaris happens to be fairly close to the north celestial pole in the skies. In fact, the Earth's rotation wobbles very slowly - called "precession" - over a span of 25,800 years. In about 3000 years, the north pole won't be pointing to Polaris, but to some other spot in the sky, and there will not be a "pole star". In about 12,000 years, the "pole star" will be Vega, and in 24,000 years it will be back to Polaris again. Because the precession is so slow, no human lives long enough to notice any changes.
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Because of a thing called "progression". That is a fancy word meaning that the earth wobbles when it rotates so the north and south poles will be towards a different area of the sky. In 26,000 years, Polaris will be the North Star again.
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