Solving one mystery of polar wander

Solving one mystery of polar wander

By Sid Perkins, 15:47 PM April 15, 2008

Astronomers have long known that the Earth wobbles as it spins. Several irregularities in rotation—small oscillations superimposed upon larger wobbles atop even larger waggles—cause the location of the true North Pole, about which the Earth rotates, to meander across the Arctic landscape.

The causes of some components of the pole's overall movement are well understood, but the driving force for one element—the so-called Chandler wobble—has remained a mystery.

Seth Carlos Chandler Jr., a busin...

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