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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sight reduction
From: Steven Wepster
Date: 2003 Feb 12, 00:39 +0100
From: Steven Wepster
Date: 2003 Feb 12, 00:39 +0100
Dutch: I made a mistake here; upon closer inspection it appears now that my tables (JC Lieuwen, Zeevaartkundige Tafels, 1949) are based on methods of Souillagouet for altitude and on Dreisonstock for azimuth. In the introduction Lieuwen states that he made some improvements: azimuth can be found without using logarithms, and altitude can be found for the DR position instead of for an auxiliary point, which apparently was considered as an awkward thing. The nautical triangle is divided in the same way as in Ageton's method, the difference lies in what functions are actually tabulated. By the Japanese method I meant the procedure where you use a small flat peace of hardware; you only press the buttons; no more flipping of pages, scribbling down of intermediate answers, or arithmetic errors. It's more convenient but less fun. I hope this is clearer. Steven. ----------------------------------------------------------- Steven Wepster wepster@math.uu.nl tel +31 30 253 1531 Mathematisch Instituut Universiteit Utrecht PO Box 80.010 3508 TA Utrecht The Netherlands =========================================================== On Tue, 11 Feb 2003, Marc Bernstein wrote: > Just curious what the Dutch modified Ageton and Japanese methods are!? >