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    Re: Mid XIX century Nav
    From: Frank Reed CT
    Date: 2005 Nov 29, 03:55 EST

    Herbet, you wrote:
    "Two of those meridians  are practical
    for navigators, because the corresponding ephemerides are  readily
    available: Greenwich and Paris. If you look at the political  situation
    in which Krusenstern is operating, it's clear why he has to go  for
    Greenwich. I assume that by doing so he established a quasi  standard
    from which to deviate afterwards nobody had good  justification."
    
    Thanks. Very interesting.
    
    Also, you've reminded  me of something I read in Marguet's History of
    Navigation. The French lunar  distance tables in the "Connaissance des Temps" were
    once again copied from the  British Nautical Almanac from 1800 to 1807 (as they
    had been previously, from  1774 to 1778). I don't know whether they were
    adjusted for the Paris meridian,  which would be simple, or copied verbatim. In any
    case, it means that Greenwich  was the sole independent source of lunar
    distance data for navigators worldwide  in the early Napoleonic period.
    
    [Marguet, "Histoire Generale de la  Navigation", 1931. No longer available at
    the original web address. Originally  pointed out to Navigation-L by Wolfgang
    Koeberer.]
    
    -FER
    42.0N 87.7W,  or 41.4N 72.1W.
    www.HistoricalAtlas.com/lunars
    
    
    

       
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