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    Lunar distances
    From: George Huxtable
    Date: 2002 Jan 25, 8:26 AM

    Dan Allen said-
    >I am, however, still waiting for George Huxtable's summary of lunars.
    >I still do not have those clear in my mind either!
    Reply, from George.-
    Dan is quite right to remind me that I have not yet fulfilled my promise.
    But I haven't forgotten it, and have been working on putting the thing
    together. It will be a few days yet.
    Let me explain the problem that I'm having. My intention at first was
    simply to supply a few relevant equations. But then the context for those
    equations needed explaining. Which brought up other matters that needed
    explaining. And so on. The whole thing starts to grow, if it's going to be
    intelligible to someone who isn't yet at all familiar with lunars.
    There's no escaping the fact that lunar distaces are a complex business. If
    there existed accessible textbooks on the subject, I could have simply
    referred the reader to those. The only modern one I am familiar with is
    C.H.Cotter, "A History of Nautical Astronomy" (London, 1968), which is very
    hard to find.
    If any reader knows of other useful textbooks on lunars, please say. Eric
    Haberfellner tells me of  "Self-Contained Celestial Navigation with H.O.
    208" by John S. Letcher, Jr., published by International Marine Publishing
    Company in 1977.
    He says- "This book (to my suprise) has a chapter on "Time by Lunar
    Distance" and a chapter on "Time by Lunar Lines of Position". This would
    make it one of the few "modern" books that deals with this subject."
    I am also informed by Eric of Bruce Stark's "Tables for Clearing the Lunar
    Distance and Finding G.M.T. by Sextant Observation", and would be
    interested to hear listmembers' opinions about this book.
    However I have had to work on the basis of writing for members who have
    access to none of those works, and are new to lunars, but are familiar with
    the basics of ordinary astronavigation and the measurement of altitude by
    sextant. Would that pitch it about right?
    More soon.
    George Huxtable.
    George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    Tel. 01865 820222 or (int.) +44 1865 820222.

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