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    Re: Mid XIX century Nav
    From: Herbert Prinz
    Date: 2005 Nov 28, 23:21 -0500

    Frank Reed wrote:
    
    >It's interesting that the Russian chart, published in
    >German, is  already referencing longitudes to Greenwich at this early date.
    >
    >
    Krusenstern explains why. I quote freely from memory from his "Voyage
    around the world, 1803-06". He says he could have used Petersburg, but
    there are already so many meridians in use by _astronomers_: Greenwich,
    Paris, Ferro ("under which, in truth, hides the one of Paris"),
    Washington; the Spanish have at least two meridians, the Portugese and
    Germans have their own, etc. For _navigators_, this is a potential
    source of confusion and dangerous. 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.
    
    Herbert Prinz
    
    
    

       
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