Chandler wobble

(redirected from Chandler circle)

Chandler wobble

(chand -ler) A small continuous variation in the location of the geographic poles on the Earth's surface. It leads to a variation of latitude of points on the Earth because latitude is measured from the equator midway between the poles. It does not affect the celestial coordinates of a body. The variation in polar location is resolved into two almost circular components, one (diameter: 6 meters; period: 12 months) resulting from seasonal changes in ice, snow, and atmospheric mass distribution; the second (diameter: 3–15 meters; period: 428 days) is believed to arise from movements of material within the Earth.

Chandler wobble

[′chand·lər ‚wäb·əl]
(geophysics)
A movement in the earth's axis of rotation, the period of motion being about 14 months. Also known as Eulerian nutation.