Euler pole
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An Euler pole is a point around which two rigid bodies, on the surface of a sphere, can be said to relatively rotate, at a given instant. Euler's fixed point theorem states that any two rigid bodies on the same sphere have a Euler pole.
[edit] Applications
A use of Euler poles is to predict the future movements of tectonic plates, as well as to calculate where they previously were.
[edit] Sources
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