NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2013 Jan 21, 15:03 -0800
Hi Geoffrey
Attached, find an image of the optical path of the prismatic reflecting circle. Note that this is from Chauvenet and not a self generated image. It shows the optical path (dotted line) at 180 degrees!
I see how the instrument becomes sensitive at 180. While the paths are parallel, they are not colinear, generating parallax. Additionally, small displacements of the instru from the line between the two objects
What then is your view on the largest possible measurable distance, as a practical matter? Should it be limited to 170? 165?
Best Regards
Brad
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