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    Re: Jupiter's moons
    From: Herbert Prinz
    Date: 2002 Mar 21, 00:48 +0000

    In the 18th/19th century navigators were often also explorers. This is the 
    reason why in many good treatises on navigation of that time, including
    those of Moore and Bowditch, there is often a chapter on surveying and 
    (harbour) charting. In the same spirit, one will find a discussion of
    Jupiter satellite eclipses. They were observed on land, not at sea. Attempts 
    at sea had been aborted early.
    
    Occultations played no role at all. They are unsuitable for longitude determination.
    
    The situation was not unlike that of establishing latitude in the 15th 
    century. The Portugese explorers sailing down the West coast of  Africa
    would establish their latitude _after_ landfall.
    
    Herbert
    
    
    Jared Sherman wrote:
    
    > Nigel-
    >  
    >
    > And this is a NAUTICAL book, expecting marine navigators are going to be 
    able to examine Jupiter's moons?? Did anyone really do that back then?
    
    
    

       
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