Mistake in Astronomical Algorithms

Randy John (skysat@home.com)
Mon, 25 Oct 1999 05:24:44 -0000

I have found a mistake in the first edition of Astronomical
Algorithms.  In Chapter 12, "Transformation of Coordinates",
there is an unnumbered equation, just after Eq. 12.6.

Transformation from horizontal into equatorial coordinates:

                     sin A
tan H = ----------------------------------
         cos A  cos(phi) + tan h  cos phi

This should really be:

                     sin A
tan H = ----------------------------------
         cos A  sin(phi) + tan h  cos phi
                ^^^
                ^^^
                ^^^
An examination of 12.1, 12.3 and especially 12.5 is revealing.
You might want to mark up your copy so you won't fall into
the same trap that I did.  Someone with the second edition will
have to tell us if the mistake is there too.  Does anyone know
of any other mistakes in AA?

            Randy


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