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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Possible limitaion for lunar distance measurement
From: George Huxtable
Date: 2009 Feb 28, 20:47 -0000
From: George Huxtable
Date: 2009 Feb 28, 20:47 -0000
Wolfgang wrote- ... The passage quoted by Kent's colleague is taken out of: "Lehrbuch der | Navigation. Herausgegeben vom Reichs-Marine-Amt. Zweite umgearbeitete | Auflage. Zweiter Band. Berlin 1906". And the passage says (in English): | | "Regarding the application of these different formulae for deducing the true | distance the following holds true: Dunthorne's formula (18), or formula 20 | deduced from it, can only be applied, if the distance is between 70d and | 110d. Formulae 21 and 23, on the other hand, can be recommended in all cases | and are the only ones to be used beyond these limitations." That's useful information. I had suspected something of the sort. But it's news to me that Dunthorne's procedure (one of the very earliest for clearing the lunar distance, and included in Maskelyne's first "Tables requisite" in 1766) is defective in that way. Does the Lehrbuch explain the reason for the problem? Is it easy for Wolfgang to copy for us formulae 18 and 20, to help us understand why? George. contact George Huxtable, at george@hux.me.uk or at +44 1865 820222 (from UK, 01865 820222) or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
