A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Peter Blaskett
Date: 2023 Dec 4, 00:51 -0800
When taking a backsight of the sun (or moon) subtract Hs from 180 degrees [corrected]. Also you must use the opposite limb corrections from how the sight appears to you. If it "looks like" a lower limbsight it is in fact an upper limb sight. This is because you have transposed the image of the body across your zenith. If it "looks like" a lower limb sight you are on fact taking an upper limb sight.