Although it discusses SH4 and not 3, you might find
this thread relevant. Rockin Robbins seems sure that the celestial mechanics are completely wrong...but as I stated there: I'm well versed in celestial navigation, but I don't own any version of SH, so I would need some specific info (
see my post #34) to help with any given situation.
Anyway, I'd be glad to help you sort out any problems if you like. Just let me know and I'll tell you what I need to know in order to see if it can be done.
Cheers!