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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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