NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Gary LaPook
Date: 2013 Jan 31, 02:22 0800
BOY! now I am really confused! I took a close look at figure 29 and the cotan scale of the HR2 does not follow the pattern of the HR1 and Bygrave in that the values on the scale do NOT change by 0.1 log cotan per spiral. I am at a loss to explain how the scales on the HR2 can work. You can see this for yourself. Take the log cotan of 81 degrees which is 0.80 so 7 spirals up (to the left) the log cotan should 1.50 which is 88° 11' but instead we find (in figure 29) 89° 19' which is log cotan 1.92. You see the same thing in figure 27, two spirals to the left of 20' should be 31' but is, instead, 42'. Can anybody explain how this can work? gl  On Thu, 1/31/13, Gary LaPook <garylapook.net> wrote:
