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    Re: Sumner lines
    From: Nigel Gardner
    Date: 2001 Feb 19, 2:48 AM

    In reply to George Huxtable's comment, he is absolutely right of course and
    perhaps I was being a bit too generalistic, there is the possibilty of
    course of a star/planet twilight shot.
    The main point I was making was that it is along track and across track
    information that is usually required, a fix will give this but not
    exclusively, and that single p/l's used intelligently will give a fix by
    run or can be used in conjunction with DR to give the navigation
    information required.
    In reply to Gordon Talge's comment, Capt. Sumner's book was published in
    1843. Norie's Epitome was rewritten by Rosser in 1889.
    A number of authors (Lecky included) refer rather loosely to any Sun p/l
    taken off the meridian as a 'Sumner line'.
    I have the second edition of a book by Cross on the Marc St Hilaire method
    called appropriately enough 'The New Navigation' undated but the worked
    examples are for 1913. In his introduction he bemoans the fact the although
    the Royal Navy used the method, few merchant navigators did.

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