NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Jim Stephens
Date: 2010 Mar 23, 18:30 -0700
Not dumb at all. A ray of light bends when it enters a piece of glass, as you know. When it passes through a window with plane, parallel sides it bends one way when it enters the glass, and the opposite way when it leaves, so if the surfaces are flat and parallel the ray emerges parallel, but displaced, from its original direction. All this amounts to is observing from a very slightly different height, and for a distant object there will be no difference.
Cheers,
Jim
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