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    Re: How did Sumner navigate in 1837?
    From: Bill Noyce
    Date: 2003 May 19, 08:34 -0400

    Jim Thompson asks:
    
    > To further demonstrate my ignorance, have I made the correct defintions for
    > the variables?
    > T = chronometer GMT
    > D = declination (from almanac)
    > L = latitude (from dead reckoning)
    > H = altitude (from sextant)
    >
    > log (1-cos T) = log [cos(D-L) - sin H] + log sec L + log sec D
    
    T here is the "Local Hour Angle" -- the angle at the pole between the
    body's meridian and the observer's.  I believe you've got the others
    correct.  Of course, H represents the sextant altitude *after corrections*.
            -- Bill
    
    
    

       
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