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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Brown-Nassau spherical computer
From: Francis Upchurch
Date: 2015 Mar 31, 00:44 -0700
From: Francis Upchurch
Date: 2015 Mar 31, 00:44 -0700
Just completed my full sized version. See attached. Details of build on request. Used Harri's wonderful graphs based equations in the original papers (thanks Harri). We had to guess the layout of the B/Y side (or dark side) since the only photo of the original in the Smithsonian is of the A/X side. (If any of our US friends happen to visit the SM, I would appreciate a detailed pic of the far side. repeated email requests have remained unanswered.) However, it works ,so I think it is correct.
So far , getting mean of 2-3' errors for Hc compared to calculator. Hc only takes about a minute. Easier and faster than Bygrave or even calculator.
I think it would pass the "Chichester Test".
More to follow, but so far so good.
Francis
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