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If you ride in an airplane - and look out of the window when the sun's shining correctly - you can see the plane's shadow on the Earth. The plane, traveling at speeds incomprehensible to ground transportation, would essentialIy cast a shadow that would appear to zoom along the Earth's surface. Again, you'd have to be standing in the right place, and the shadow would likely be considerably dim. This occurrence is less likely, methinks.  Just look around and be surprised.
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