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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: What is the Longest Lunar Possible?
From: W F Jones
Date: 2013 Jan 21, 17:32 -0500
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 > > : http://fer3.com/arc/m2.aspx?i=122041 >