Description: The earth revolves around the sun in an orbit which is a special geometric figure called an ellipse. An ellipse has two "center points". Each one is called a focus. The Sun is not in the exact middle of the earth's orbit.
Keywords: ellipses, earth, revolves, sun, orbit, special, geometric, figure, called, ellipse, center, points, focus, exact, middle
Created by: Tim Conner Added: 2005-09-01
Earth Science (Astronomy) Views: 3999
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