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Earth was not flat because ?

  1. Aug 2, 2010 #1
    earth was not flat because ??

    ancient astronomers knew that the earth was not flat because it cast a circular shadow during a lunar eclipse. state another observation that led them to the same conclusion
  2. jcsd
  3. Aug 2, 2010 #2

    Vanadium 50

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    Re: earth was not flat because ??

    This sounds like homework. Please reread the PF Rules about homework.
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