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What is nutation?

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... or "nodding," of the earth's axis ...

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Newspaper article from: Physics Week ...perturb the angular momentum of the entire Earth and produce an additional free nutation of the celestial pole called free core nutation (FCN). Since this nutation causes resonances in the diurnal tides and in the expansions of luni-solar nutation...
Nutating gear drivetrain for a cordless screwdriver.
Magazine article from: Mechanical Engineering-CIME ...Coupling the mathematical concept of nutation with straight bevel gears, a class of...mathematics discovered the concept of nutation almost by accident. He was spinning...peculiar wobble takes place; this wobble is nutation. As a coin wobbles, it traces a circle...
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Newspaper article from: Science Letter ...recently discovered concerning the Earth's nutation (small variations in the position of...Earth (lunisolar precession) and the nutation, or wobbling, of the Earth's rotation...recently that the amplitude of the Earth's nutation is out of phase with the tidal force...
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Newspaper article from: Physics Week ...Strasbourg, France, "Free core nutation (FCN) can be observed by its associated resonance effects on the forced nutations of the Earth's figure axis, as...amp; Astrophysics (Free core nutation resonance parameters from VLBI and...
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Magazine article from: Design News ...of rotation intersects the axis of nutation of the eccentric assembly. It also intersects the eccentric's axis of nutation along the plane that passes through...motor shaft's rotation drives the nutation of a plate. Secured to the pistons...
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