Precession

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Precession

</dt>
Change in the direction of the axis of rotation of a spinning body, as a gyro, when acted upon by a torque. See apparent wander, precession of the equinoxes. </dd>
The direction of motion of the axis is such that it causes the direction of spin of the gyro to tend to coincide with that of the impressed torque. The horizontal component of precession is called drift, and the vertical component is called topple. </dd>

References

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