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    Re: Celestial observations v. Coast Survey Methods
    From: Herbert Prinz
    Date: 2002 Jan 18, 7:40 PM

    Thanks for the pointer to this highly interesting web site.
    
    Concerning the use of the telegraph, make no mistake: The determination of longitude
    was still based on the exact same old celestial methods, mostly timing transits.
    Just the technology of time signals (nowadays we would say: time transfer) has
    changed. First there were eclispses, then lunar distances, then the telegraph, then
    radio, and finally the GPS.
    
    Herbert Prinz (from 1368950/-4603950/4182550 ECEF) (datum-free!)
    
    Chuck Griffiths wrote:
    
    > I always figured they mostly
    > took very accurate celestial observations. If you thought so too, check out the
    > history of the US Coast Survey at http://www.lib.noaa.gov/edocs/CONTENTS.htm. It
    > will completely amaze you. For instance, the first truly accurate longitude
    > reference in the US came using the "American Method" - using the telegraph to
    > determine time difference between two points.
    

       
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