A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Ed Popko
Date: 2016 Nov 19, 11:58 -0800
Frank, a point of clarification. You said:
"Bring the Sun's reflected and direct images together with the reflected image above, limbs perfectly touching. Note this ON-ARC angle. It should be around half a degree. Let's suppose it's 32.1' for a specific example; call that D1."
When I place the reflected image above the direct image, my readings are always OFF THE ARC, not on-arc as you suggest. Thus, for D1, I subtract my off-arc reading from 60? Doing this would mean in your example, your original reflected above direct image reading was 27.9' OFF (not on-arc as stated in your post) and D1 is 60-27.9=32.1 as you report.
Perhaps I did not read your example right but the tests I did on the sun this afternoon shoed reflected above direct were always off-the-arc.
When reflected is below direct, the angle is on-arc.