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    Re: Preston's paper on Lewis & Clark's Navigation
    From: Bruce Stark
    Date: 2003 Jun 8, 14:39 EDT

    There's a very confusing statement in my last post. I said something to the
    effect that Preston was trying to understand Lewis and Clark data in terms of
    twentieth century celestial navigation. That would suggest he was trying to
    understand it in terms of lines of position, etc.
    
    Preston was far beyond that. What he hadn't grasped was how navigators of
    that era thought about time and longitude.
    
    In most cases, we need accurate Greenwich time before we can work
    observations successfully. The old navigators didn't. This is because, from the old
    perspective, we've turned things around and put the cart in front of the horse.
    
    Bruce
    
    
    

       
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