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    Re: from a watcher
    From: Bill Murdoch
    Date: 2002 Oct 18, 22:10 EDT
    In a message dated 10/18/02 12:27:06 AM Eastern Daylight Time, danallen46@ATTBI.COM writes:


    The first chapter
    of W. M. Smart's classic "Textbook on Spherical Astronomy" is all
    about this formula and how it is derived and used.  If you understand
    this formula and how to use it, you can do much of sight reduction
    in your sleep.  It is not a difficult formula and it is worthy of
    everyone's study.


    Chapter 1 section 5 derives the cosine formula from simple plane trig. I have used it in USPS JN courses to answer the question, "Where did that formula come from?"  It is not too hard to pick your way through.

    Bill Murdoch
       
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