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    Clock synchronization
    From: Patrick Stanistreet
    Date: 2004 Feb 4, 20:08 -0800

    Based upon a rather hasty bit of research concerning how it
    was possible to synchronize clocks in different parts
    of the world it seems that galileo, cassini and others
    that I cannot credit due to ignorance came up with the
    idea of creating an astronomical clock based on the
    eclipses of jupiters moons.  By creating accurate
    tables of the times of the eclipses it was possible
    to set clocks to both local time and greenwich time
    to perhaps a few seconds at locations quite distant
    from each other.  Although not a feasible method
    for ships on the ocean, they could at least compare
    their clocks in ports that had observatories monitoring
    jupiters moons.
    
    The next question is say at greenwich, how was it decided
    to set the local time to a particular clock time say 12:00
    noon to the second?  Was it a convention or was their some
    method useful to any nearby observatory?
    
    
    

       
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