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    Creamer's navigation without instruments. was:[NAV-L] The point of it all
    From: George Huxtable
    Date: 2006 Jun 27, 20:15 +0100

    Peter Fogg wrote-
    |
    | > "If a zenith body can be found and identified then the
    | > boat's position is known."
    
    and I replied-
    | > No, it isn't. Not unless you know the time. How do you get that,
    | > without any instrument?
    
    To which Peter's reply was-
    
    | Refer to helpful comment above re lack of precision. To put that
    another
    | way, how would he not have at least a rough idea of the time? Lack
    of
    | precision is not necessarily the same as lack of accuracy. Folk
    without a
    | written language tend to have great memories and compensating skills
    we may
    | find difficult to comprehend. Without a clock they may get better,
    for
    | example, at estimating the passage of time. Remember that the
    apparent
    | movement of the stars across the night sky is itself akin to a giant
    clock,
    | or reference. The point I was trying to make, that I took as the
    moral of
    | Creamer's accomplishment, is that nav should be a holistic process.
    We
    | should be ready to embrace, or at least consider, all possible
    methods.
    
    ====================
    
    To infer one's position from knowing that a particular star is at the
    zenith, as Peter has proposed, the time that's needed is not local
    time; it's Greenwich time. So how does he suggest that Greenwich time
    should be obtained, without a clock? What he has written above is
    utter nonsense.
    
    George
    
    contact George Huxtable at george@huxtable.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
    

       
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