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    Re: Longhand Sight Reduction
    From: Greg Rudzinski
    Date: 2014 Nov 19, 07:36 -0800

    Hanno,

    The Doniol formula at the bottom of the sin cosine table would be better listed as:

    Sin Hc = n-(n+m)a

    n= cos(L-d) , m= cos(L+d)  same name

    n= cos(L+d) , m= cos(L-d)  contrary name

    a= hv(t)

     

    When doing the reduction in the two column format p= the product value of column A where p= (n+m)a which speeds the reduction and saves space on the index card.

     

    Greg Rudzinski

     

       
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