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    Manual calculation of compass variation
    From: Lisa Fiene
    Date: 2004 Oct 16, 09:22 +1000

    Can someone explain to me how James Cook did the following:
    
    "Found the Variation of the Compass by the Even'g and Morning Amplitudes
    and by 2 Azths to be West 20? 59'"
    
    I've just been reading through some of his log entries, and don't really
    understand this one.
    
    Now we know by the compass roses on our charts what the relevant compass
    variation is, so have never really thought of how this is actually
    calculated.
    
    Thanks, Lisa
    
    
    

       
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