NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Bill Morris
Date: 2011 Oct 14, 12:43 -0700
Frank writes "BTW, that "article suggesting a tilt of a couple of degrees could introduce 7 miles of error" is an exaggeration. But it depends on the details."
Tilt error depends on the observed angle as well as the amount of tilt. The unsuccesful ball-recording octant of WWII had a correction table that indicates that a tilt of two degrees at about 70 degrees angle would introduce an error of seven minutes.
Rnadall could eliminate potential shade error by not using the sextant's shades at all and placing his crossed polaroids at the eye-end of the telescope
Bill Morris
Pukenui
New Zealand
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