NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Certaine Errors in Navigation Corrected
From: George Huxtable
Date: 2007 Sep 25, 23:55 +0100
From: George Huxtable
Date: 2007 Sep 25, 23:55 +0100
Thanks to Gary LaPook for bringing to our attention that treatise by Wright, and the puzzle his diagrams represent. There's been little or no reponse so far, and perhaps that's because others, not just me, have been struggling to understand what's behind Wright's construction. I agree with Wright that his first construction, in the case where the departure point and the destination are at the same latitude, gives an exact answer. He proposes a second, different, construction when those latitudes differ. However, if you then apply that second construction to the special-case where the latitudes are in fact the same, it should boil down to the same thing as the first construction. I'm not sure that it does. So I'm not convinced yet that he has got things right. Could there be another typo in his text, perhaps, or in the labelling of his diagram? George. contact George Huxtable at george@huxtable.u-net.com or at +44 1865 820222 (from UK, 01865 820222) or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---