I recently took a deep field image of Markarian's Chain that I want to align and analyze on CDC. http://www.geocities.com/astrodad32/Markarian_L50_RGB30ea_RC_fl.jpg
I can get it "pretty close" but can only rotate the screen at 15 deg. increments. How can I precisely control background image orientation to match the image I made? Anyone who knows this will heretofore be considered wise in the ways of Cartes du Ciel in my book:-)
