Motions of the Earth Polar Variation

About the different motions of the earth that are going on around us astronomically and geologically including polar variation.

MOTIONS OF THE EARTH

4. POLAR VARIATION

The earth rocks vary slightly with relation to the North and South poles, making the position of each pole wander in a circle with a 10-to-50-ft. diameter. Called the Chandler Wobble, after the Massachusetts businessman who discovered it, the poles' motion may result from movements of the atmosphere. The Chandler Wobble shifts any given latitude--the imaginary lines measuring the distance toward or away from the equator--by several feet during its cycle of 14 months.