Thanks Karl. I had thought of that (and I know you get mirror image swap as well in some systems?), but was hoping that there was some convention to return the images to the up/down/left/right as seen by eye (or with my binoculars!). I've scratched my head over lunar images, but think I have them sorted out now! Of course, where you are standing on the Earth, the elevation of the object and whether you are watching it rising or setting confuses everything!
Perhaps it's back to knitting again? Perhaps not, I'd rather stand out in the cold and be confused about what is up and what is down!
