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    Re: Dreisonstok Compliments Weems
    From: Greg Rudzinski
    Date: 2009 Dec 14, 13:43 -0800

    I would like to add this rule for all bodies :
    A. If Latitude and declination are the same in name use Dreisonstok.
    B. If Latitude and declination are contrary in name use Weems.
    This will keep things positive.
    On Dec 14, 12:50�pm, Greg Rudzinski  wrote:
    > In the process of comparing short methods of non electronic sight
    > reduction it came to my attention that the subtle differences between
    > Dreisonstok and Weems tables actually compliment each other very well
    > thus making it worth while having both copies at hand. The beauty of
    > having both lies in the treatment of declination as a plus or minus.
    > What I like to do is add instead of subtract where ever possible so by
    > using Weems in the northern hemisphere fall/winter and Dreisonstok in
    > the northern hemisphere spring/summer addition of declination is
    > maintained. The other beautiful compliment is the graph vs. tabular
    > azimuth determination. When speed is needed then the Weems graph is
    > used. When accuracy for compass error determination is needed then
    > Dreisonstok is used. Once an Hc is determined by Weems then extracting
    > Z' and Z" from Dreisonstok is simple.
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