Define nutation. nutation synonyms, nutation pronunciation, nutation translation, English dictionary definition of nutation. n. 1. The act or an instance of nodding the head. 2. A wobble in a spinning gyroscope or other rotating body. 3. Astronomy A small periodic irregularity in.
nutation: [ noo-ta´shun ] the act of nodding, especially involuntary nodding.
Nutation (astronomy and mechanics) In mechanics, a bobbing motion that accompanies the precession of a spinning rigid body, such as a top. In simple precession, the axis of a top with a fixed point of contact sweeps out a cone, whose axis is the vertical direction.
· nutation (countable and uncountable, plural nutations) (physics) A bobbing motion that accompanies the precession of a spinning rigid body. A nodding motion (of the head etc.). (astronomy) Any of several irregularities in the precession of the equinoxes caused by varying torque applied to the Earth by the Sun and the Moon.
· Nutation and counternutation are movements that happen at the sacroiliac joint. The sacroiliac joint is where the sacrum meets the two sides of the pelvis. Nutation (from neutral again) is where the top part of the sacrum moves down and forward relative to the pelvis being fixed in place. Kapandji, referenced above, describes this as the sacral.
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