http://science.nasa.gov/headlines/y2002/02dec_isseclipse.htm?list617619
A picture caption from this page: "Left: British astronomer Andrew
Sinclair created this animation of the Moon's shadow on Dec. 4th. Within
the lightly shaded area (the penumbra) observers see a partial eclipse.
The area of total eclipse is marked by the tiny dark spot (the umbra) at
the center of the shadow."
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