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    Re: clock synchronization
    From: George Huxtable
    Date: 2004 Feb 5, 19:04 +0000

    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.
    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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