Earth`s shadow

The Earth`s shadow or Earth shadow (also sometimes known as the dark segment) are names for the shadow that the Earth itself casts on its atmosphere. This shadow is often visible from the surface of the Earth, as a dark band in the sky near the horizon. This atmospheric phenomenon can sometimes be seen twice a day, around the times of sunset and ....
Found on http://en.wikipedia.org/wiki/Earth`s_shadow
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