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Subject: Re: from a watcher
WSMurdoch@XXX.XXX
Date: Fri Oct 18 2002 - 22:10:01 EDT
In a message dated 10/18/02 12:27:06 AM Eastern Daylight Time,
danallen46@XXX.XXX 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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