Re: Mixed Coordinate conversion - ra from long and dec

Many thanks Bill, that was just what I needed.
The mcosM substitution was the key, I didn't spot that one. Instead I
went off with tan half angles and quadratic roots - ending in a mess
that I never found my way out of!

Ernie was also correct, in that it is about finding the solution to the
interesction of two circles, but the cartesian approach was just too
scary.

Dave Blake

.

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