Nutation

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Nutation

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1. The oscillation of the axis of any rotating body, as a gyroscope rotor. </dd>
2. Specifically, in astronomy, irregularities in the precessional motion of the equinoxes because of varying positions of the moon and, to a lesser extent, of other celestial bodies with respect to the ecliptic. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use