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    Re: Azimuth and Declination formulae
    From: Peter Fogg
    Date: 2005 Jul 20, 16:26 +1000

    > From Lu Abel
    >
    > ...The whole reason for versines and haversines was to allow sight
    > reductions to be done using logarithms (and therefore the requisite
    > multiplications become additions); but logs are not defined for negative
    > numbers, hence the need to shift everything to have a positive value.
    >
    
    So in order to use haversines log tables are needed?
    
    
    

       
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