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    Re: What is the Longest Lunar Possible?
    From: W F Jones
    Date: 2013 Jan 21, 17:32 -0500

    Mirror flatness must be superb for large angles.
    
    Frank
    Rochester, NY
    
    On 1/21/2013 4:00 PM, Geoffrey Kolbe wrote:
    > ------------------------------------------------------------------------
    >> ------------------------------------------------------------------------
    >> Brad, you wrote:
    >> "Is there a place on earth where we could observe a lunar distance of
    >> ~180 degrees? Perhaps in the polar regions, where the sun never sets
    >> but skims the horizon and the full moon simultaneously visible to the
    >> observer?"
    >
    > The problem with angles ~180 degrees is that the measured angle would
    > become extremely sensitive to parallax errors in the measuring instrument.
    >
    > Geoffrey
    >
    > View and reply to this message: http://fer3.com/arc/m2.aspx?i=122041
    >
    
    
    
    

       
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