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    Re: Visibility at rising and setting
    From: Chuck Taylor
    Date: 2000 Apr 25, 10:47 AM

    On Tue, 25 Apr 2000, George Huxtable raised the topic of
    celestial observations of the Sun, Moon, stars, and planets
    as they rise or set.
    Certainly one could argue that such sights are less than
    ideal.  I think it is appropriate, however, to consider them
    in the context of "Lifeboat Navigation" or "Emergency
    Navigation."  I don't think anyone would claim that such
    sights are superior to ordinary sextant sights, but in
    extraordinary circumstances when a sextant is not available,
    they could be quite useful.
    I remember many a clear night horizon in the western Pacific
    Ocean and the South China Sea from my U.S. Navy days.  I
    agree with George that lack of a clear horizon could be a
    problem in the northern oceans.
    Chuck Taylor
    SEASCAPE GB 32-2
    Everett, WA, USA

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