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    Re: The Nautical Day
    From: George Huxtable
    Date: 2004 Feb 8, 11:02 +0000

    I would like to thank Herbert Prinz for a well-argued reply to my question
    about the choice of time-argument in the early Nautical Almanac.
    
    Trevor Kenchington wrote, with other interesting comments-
    
    >I do have Greenhill & Hackman's "Herzogin Cecilie" (1991), which
    >includes some quotations from that ship's logbook in the hours leading
    >up to her stranding in 1936. Those clearly used the civil day (changing
    >24 to 25 April at midnight). Thus, I would tend to agree with George's
    >scepticism. Before withdrawing any suggestion of such a late use of the
    >nautical day, however, I would note that the same logbook says that they
    >"Changed the ship's time to land time at 2100 hours" of the day that
    >they arrived off Falmouth for orders. Most likely, that was either a
    >matter of correcting their reckoning for small accumulated errors in
    >their chronometer time or perhaps an adjustment of the watch schedule to
    >match GMT rather than local apparent time. However, it remains possible
    >from this limited evidence that the ship had been using the nautical day
    >during her blue-water voyage from Australia and changed to the civil day
    >on arriving in coastal waters.
    
    It seems likely likely to me that the phrase "Changed ship's time to land
    time at 2100 hours" really did imply that they changed from a noon-to-noon
    reckoning on the log to using midnight-to-midnight civil time. But what
    causes Trevor to think that the noon-to-noon reckoning could have been by
    the Nautical Day, 12 hours ahead of the Civil Day, rather than by the
    Astronomical Day, 12 hours behind the Civil Day? That's what I am trying to
    establish; the era in which Nautical Time finally fell out of use.
    
    George.
    
    
    ================================================================
    contact George Huxtable by email at george@huxtable.u-net.com, by phone at
    01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy
    Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    ================================================================
    
    
    

       
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