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Actual satellite imagery spliced together to create a movie illustrating seasonal changes in sunlight. Taken from a geostationary satellite, the Flash movie can be stopped at key points in the video to discuss solstices and equinoxes. It should be pointed out that the earth�s axis remains fixed in its orbit around the sun and that the apparent wobble is due to changes in the circle of illumination. This can best be verified by looking at the position of Australia which remains constant throughout the movie. The animation can be rewound or paused to stress important points.
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