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    Re: clock synchronization
    From: Robin Birch
    Date: 2004 Feb 5, 21:32 +0000

    You live and learn.
    
    Loved your last post as it contained all of the bits I really didn't
    know and was very informative :-)
    
    Cheers
    
    Robin
    
    In message , George Huxtable
     writes
    >Robin Birch said, regarding Greenwich observatory-
    >
    >
    >>Originally they indicated 12:00 by dropping a signal ball on a post on the
    >>roof (it's still there and I believe they still do this).  This was visible
    >>from most of the anchorages in the Thames until you got to Tower Bridge and
    >>so ships could set their clocks to 12:00.
    >
    >Not "originally": The observatory had been going for about 150 years before
    >the time-ball was instituted in 1833. And not at 12:00, but at 1 pm GMT, to
    >allow navigators to do their normal noonday business beforehand.
    >
    >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.
    >================================================================
    
    --
    Robin Birch
    
    
    

       
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