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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: FW: Parallactic Retardation
From: Rodney Myrvaagnes
Date: 2004 Jan 29, 23:26 -0500
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