NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Custom Polaris Table SHA / Dec 2020-2030
From: Geoffrey Kolbe
Date: 2019 Oct 21, 10:49 -0700
From: Geoffrey Kolbe
Date: 2019 Oct 21, 10:49 -0700
Greg Rudzinski wrote:
"I was not satisfied with the precision of annual corrections to the Polaris SHA and declination mean value as shown on page 256 of out of date Nautical Almanacs so I constructed a more precise custom Polaris SHA/dec table to be kept with out of date NAs. "
Given that at a declination of 89.3°, a degree of SHA (longitude) is only about 2/3 of a nautical mile, why are you stating SHA to 0.1 minutes, or about two metres on the ground...? For the usual CelNav purposes, just stating SHA to the nearest degree would be good enough.
Geoffrey Kolbe
