NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Fleming
Date: 2011 May 5, 09:09 -0700
Marcel your pictures that geometric dip is not the same as a straight line from body to the horizon point. This is correct. Caused by refraction as you showed in curved red line. It is not as shown a smooth arc as I'm guessing you know but experiences the curve only as it enters the atmoshpere which I am not convinced happens a 8 miles height. Could somebody check that?
cos ( GeoDip) = 1 / ( 1 + (hE/RE)^2)
take RE = 6378 mi + 8 mi
he = 211 mi
GeoDip = 2.68 deg
Dave Fleming
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