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Sighting points on a sphere

  1. Dec 4, 2008 #1
    What is the greatest number of points on a spherical planet so that no two might
    be observed at a time from an external point?
  2. jcsd
  3. Dec 4, 2008 #2


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    If you can look at the sphere from infinity, then it's 1.
    Last edited: Dec 5, 2008
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