True polar wander is a solid-body rotation of a planet or moon with respect to its spin axis, causing the geographic locations of the North and South Poles to change, or "wander". In a stable state, the largest moments of inertia axis is aligned with the spin axis, with the smaller two moment of inertia axes lying in the plane of the equator. When this is not the case, true polar wander will occur: the planet or moon will rotate as a rigid body to realign the largest moment of inertia axis with the spin axis.
Read more about True Polar Wander: Description in The Context of Earth, Examples, Distinctions and Delimitations, Tectonic Plate Reconstructions, See Also
Famous quotes containing the words true, polar and/or wander:
“Never mind the ridicule, never mind the defeat: up again, old heart!—it seems to say,—there is victory yet for all justice; and the true romance which the world exists to realize, will be the transformation of genius into practical power.”
—Ralph Waldo Emerson (1803–1882)
“In time your relatives will come to accept the idea that a career is as important to you as your family. Of course, in time the polar ice cap will melt.”
—Barbara Dale (b. 1940)
“Lest he should wander irretrievably from the right path, he stands still.”
—William Hazlitt (1778–1830)