Hi Barry,
Sorry it has taken me a while to get back to this link.
I have been trying to think of how to do exactly what you have done.
I found Astrohelper here
http://casazza.net/astrohelper/
I am impressed
with your effort. The challenge for me now is to work out how you did it.
I am waiting on a book I bought through Amazon...
"Astronomical Formulae for Calculators"
perhaps there will be something in it which may help.
By the way you program works on my Win7 32bit OS.
Thanks