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Great Circle question

  1. Jun 20, 2009 #1
    Hi all,

    I'm trying to figure out how to get all the points that lie on a great circle. Could anybody help me with this please ?
     
  2. jcsd
  3. Jun 21, 2009 #2

    HallsofIvy

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    Given what information? How are you given the great circle?
     
  4. Jun 21, 2009 #3
    If I'm gven two points with it's lat/lon
     
  5. Jun 22, 2009 #4
    The two points are the start point and the end point. I need to know all the points thru which the great circle arc would pass thru.
     
  6. Jun 26, 2009 #5
    Rotate the sphere twice, so that one point is the north pole and the other point lies on the great circle connecting (0,0,1) to (1,0,0). Figure out the points, then rotate back.
     
  7. Jun 26, 2009 #6

    tiny-tim

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    Welcome to PF!

    Hi hussainak! Welcome to PF! :smile:

    Another method: the two points and the centre of the sphere define a plane.

    That plane intersects the sphere in a great circle. :wink:
     
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