Awesome, I love your approach.

If you are using the J2000 epoch data -- well, is this map associated with a story? And, if so, is that story set i the future or the present?

I ask because I'm doing a map based in 15,605 A.D., and the positions of stars & planets are all different. Even the Zodiac will be different. I've decided to rely on the Starry Night proggy for it, although I've found conflicting data from other sources.