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    Re: Possible limitaion for lunar distance measurement
    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{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
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