I've oriented the Hitchhiker's Guide around pages in Rukl's atlas, because the first thing I noticed when I started observing the moon was that it was the one reference book that everybody else had (and when I finally bought it, I found out why).
Unfortunately it's out of print. Sky Publishing bought the rights from the previous publisher, Kalmbach, quite a few years ago; they've been promising it "next season" or "in a few months" ever since then. Pestering them about it couldn't hurt -- it's probably good to remind them that people want to see this book back in print.
Cool book; often runs about $150 (I've seen copies for more, but they are rip-offs).