How much of the Earth is always in darkness?
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Huh?
Drag the pointer to shade in the darkness...
Done!
Hint
Solution
Equator
North Pole
South Pole
How much of the Earth is always in darkness?
Shade in what you think
(pretend the date is around the Spring or Fall Equinox)
and click "Done"...
This applet is Copyright © 2011 by Tom Whittaker.