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    Re: 1851 Bowditch
    From: Bruce Stark
    Date: 2003 Feb 1, 15:52 EST

    Fred,
    
    One thing we've often been told the old navigators couldn't do was get
    latitude if they missed the noon observation. They had a number of ways of
    doing that. Any two altitudes of the sun we could use for a fix would give
    them their latitude. Local time too, if they wanted it.
    
    And, do you remember what we went through on the list last year in order to
    convince people they didn't need accurate Greenwich time to calculate
    accurate altitudes? It started last winter as I recall, and the problem kept
    coming up.
    
    The main thing to keep in mind when you read that 1851 Bowditch is that you
    are in a different world. Celestial navigation as we know it would have been
    useless. It requires that you know Greenwich time before you can work your
    observations successfully. Our celestial navigation, and the nautical
    astronomy Bowditch knew, are two different animals. Key words and phases had
    different meanings then. Don't jump to conclusions when you read that 1851
    "Navigator." Follow through, work the "problems," and see what Bowditch DOES.
    
    Bruce
    
    
    

       
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