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At 03:43 PM 11/4/2007, you wrote:

>Michael Dorl wrote-
>
>| Back in 1999, I sat down and worked out the spherical trig for this
>| problem.  It may be found at
>|
>| http://ns.doit.wisc.edu/~mdorl/Sight%20Reduction%20write%20up.doc
>|
>| I am pretty sure it handles all the quadrant problems  I did not consider
>| problems at angles when the trig functions misbehave.
>
>====================
>
>That's interesting, and timely. Except in detail, it's on exactly the same
>lines as the procedure quoted in John Karl's book. Understand one , and you
>will understand the other.
>
>However, one of those details is a silly error in Michael Dorl's program, in
>which his final equation for Cos(T), on the last page, should  not be-
>
>cos(T) = [Sin(AltJ)-Cos(DeclJ)Sin(Lat)] / Cos(DeclJ)Cos(Lat)
>but instead-
>cos(T) = [Sin(AltJ)-Sin(DeclJ)Sin(Lat)] / Cos(DeclJ)Cos(Lat)
>
>Mike will kick himself when he sees it! Making that change, and allowing for
>different notation, his equations for Sin(Lat) and for Cos(T) then
>correspond EXACTLY with John Karl's 7.5d and 7.5e.

Well shucks :-(  I did have it right in the c++ program so I must have made
the error when I wrote up the description.
Many thanks for pointing it out, I will fix it.

Mike


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