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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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