NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
True Distance vs. Observed Distance
From: Greg Rudzinski
Date: 2012 Sep 17, 09:47 -0700
From: Greg Rudzinski
Date: 2012 Sep 17, 09:47 -0700
Linked is a diagram showing how refraction changes observed distance between celestial bodies. For the diagram the bodies have a distance about 45* with the zenith directly above the observer. The refraction correction is added to the observed distance to get a true distance. If starting with a true distance from a GC calculator then the refraction correction is subtracted from the true distance to get the observed distance.
Greg Rudzinski
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