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    Re: FW: Parallactic Retardation
    From: Rodney Myrvaagnes
    Date: 2004 Jan 29, 23:26 -0500

    Thanks, Doug
    
    On Thu, 29 Jan 2004 12:44:53 -0800, Royer, Doug wrote:
    
    >
    >Rodney,yes and no to what you wrote below.Yes to a partly or full moon
    >providing a visible horizon 20 or so degrees on either side of the
    >moons'azimuth.No to not being able to measure altitude at all when the
    >moons' light is reflected off the surface of the water.
    >Most quality newer sextants have a lightly shaded polarising shade/shades
    >and one can get a good horizon even when measureing an altitude closer to or
    >at the moons' azimuth.Or you can use a combination,depending on the
    >brightness of the reflected light on the waters' surface,of a number  of the
    >sextants' shades to get a good horizon to use for measureing either the
    >moons' or other body's altitude at a time like this.
    >
    
    
    Rodney Myrvaagnes   NYC                                                        
                        J36 Gjo/a
    
    
    "Curse thee, thou quadrant. No longer will I guide my earthly way by thee."  Capt. Ahab
    
    
    

       
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