Nutation

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Rotation (green), precession (blue) an nutation in obliquity (reid) o a planet

Nutation (frae Laitin nūtātiō, "noddin, swayin") is a rockin, swayin, or noddin motion in the axis o rotation o a lairgely axially symmetric object, such as a gyroscope, planet, or bullet in flicht, or as an intendit behavior o a mechanism.