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physical phenomena > process > physical process > motion > axis motion > nutation

nutation comparison table

Subject	is a kind of	has definition
axis motion	motion	the motion of the axis of a system
nutation	axis motion	A small, irregular oscillation in the precessional motion of Earth's rotational axis, caused primarily by lunar perturbations. It has a principal period of 18.6 years, and moves the equinox as much as 17" ahead of or behind its mean position.

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