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GPS satellites tell us where we are, but what tells them where they are?

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  • gc_scout
    Have you ever thought what tells the GPS satellites where they are in the first place? Read more: http://bit.ly/1Apyrs
    Message 1 of 1 , Nov 2, 2009
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      "Have you ever thought what tells the GPS satellites where they are in the first place?"

      Read more: http://bit.ly/1Apyrs
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