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    Re: facing Mecca
    From: John Huth
    Date: 2009 Sep 30, 19:34 -0400
    Greg's right.   I did some digging and found out - there is some coupling to the concept that you would "see" Mecca if you could look through the Earth, but there is somehow a projection to the surface that's part of the canon I don't quite understand.

    In terms of the geometry of "facing" Mecca, I guess there are two singularities - one is right at Mecca, where "facing" is indeterminate, but I guess that's OK because the tomb of the Prophet has a finite area.   The other singularity, as George and Greg point out, is at the antipodal point.

    On Wed, Sep 30, 2009 at 7:26 PM, Greg Rudzinski <gregrudzinski---.com> wrote:

    Technically the correct direction would be a chord through the earth
    to Mecca on an absolutely straight line. A great circle would be a
    good place to start. The act of bowing down would cover mecca at some
    point during the bow. If I were muslim that would be how I would do
    it.

    On Sep 30, 3:29 pm, Apache Runner <apacherun...---.com> wrote:
    >  The only reason I asked was because a student came to me and said he prayed
    > to the SE (I'm on Boston) and his friends prayed to the NE - he thought he
    > was right, and then I realized that there's this issue about rhumb lines vs.
    > the great circle.   After digging around, I round that great circle seemed
    > to be the preferred direction for various religious reasons.



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