Instant Centre Of Rotation
The instant center of rotation, also called instantaneous center and instant center, is the point in a body undergoing planar movement that has zero velocity at a particular instant of time. At this instant the velocity vectors of the trajectories of other points in the body generate a circular field around this point which is identical to what is generated by a pure rotation.
Planar movement of a body is often described using a plane figure moving in a two dimensional plane. The instant center is the point in the moving plane around which all other points are rotating at a specific instant of time.
The continuous movement of a plane has an instant center for every value of the time parameter. This generates a curve called the moving centrode. The points in the fixed plane corresponding to these instant centers form the fixed centrode.
Read more about Instant Centre Of Rotation: Pole of A Planar Displacement, Instant Center of A Wheel Rolling Without Slipping, Instant Center of Rotation and Mechanisms, Examples of Application
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—Mason Cooley (b. 1927)