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    Re: Azimuth Formula Questions
    From: Bill B
    Date: 2005 Oct 31, 21:47 -0500

    George wrote:
    > Anyway, it's becoming clearer how that discrepancy between the two methods
    > arises, thanks to Paul. The Meeus formula, with its sign conventions chosen
    > as stated, and its straighforward quadrant-adjustment, seems much more
    > simple,  and  demands less in the way of mental contortion. I wonder if
    > others agree.
    No disagreement from me.  If I recall, this all started with a question I
    had regarding the pros and cons of George's formula vs. how the 229 folks
    claim they calculate Z and Zn.  Now I know, thanks to George's insights. And
    as usually, gained more knowledge than I bargained for.  Why mess with a
    longer formula that has to many qualifiers once calculated?
    I do maintain tabular methods are great for learning and backup.  I spent
    many hours inspecting the tables and began to see wonderful patterns
    emerging as most of the spherical-trig math was predigested for me.  And I
    still love David Burch's slick trick for using the 229 tables to find the
    real slope when plotting data points. LMS my foot. 

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