A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Marty Lyons
Date: 2014 Nov 15, 09:50 -0800
I took some sights and decided to reduce them longhand to stay in practice. I checked them with software. I find some significant differneces in the calculated altitudes. So I calculate some known correct sample problems longhand and compare to software, I find that the Hc's differ by 4-5 minutes. I am thinking this is pretty significant. I used the HO 229 longhand method and these websites for computer solutions.
The two websites pretty much agree. The differences appear to be in the Hc. Any thoughts on why HO 229 method leads to different results than computer solutions?