| 1. | The rotation axis of the main telescope needed to be exactly horizontal.
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| 2. | Polar motion is the movement of Earth's rotation axis across its surface.
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| 3. | The rotation axis of highest order is known as the principal rotation axis.
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| 4. | Thus, is left invariant by and is hence a rotation axis.
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| 5. | The rotation axis is not at the North Pole any more,
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| 6. | Any Kerr Newman source has its rotation axis aligned with its magnetic axis.
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| 7. | The rotation axis of highest order is known as the principal rotation axis.
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| 8. | However, over thousands of years their direction averages to the Earth's rotation axis.
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| 9. | A three-dimensional object always rotates around an imaginary line called a rotation axis.
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| 10. | :The Coriolis effect will act perpendicular to the rotation axis of the Earth.
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