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    cowgrlbabe21's Avatar
    cowgrlbabe21 Posts: 1, Reputation: 1
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    #1

    May 17, 2007, 01:52 PM
    The sun lighting the earth
    What present of the earth can be lighted by the sun at any time?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    May 17, 2007, 02:06 PM
    Present? You mean percent?

    Do a thought experiment - if you shine a flashlight on a tennis ball from a few feet away how much of the tennis ball can the flashlight light up at once? Or when you look at a tennis ball, how much of it can you see at one time?

    The pursists out there may note that the sun actually lights up a bit more of the earth than the above would imply, due to refraction of light through the earth's atmosphere. But that's a detail.
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