Bad Astronomy: Misconceptions and Misuses Revealed, from Astrology to the Moon Landing "Hoax" - Philip Plait This was a fun read. It taught me some stuff I didn't know, and clarified some concepts I only vaguely knew about. But in the end I think I prefer Plait's website. The stuff I really like--the debunking of movie "science"--was only a short chapter in the book, and there's much more of that at the blog.

Also, something that happens EVERY SIX MONTHS (such as an eclipse) is not a "rare" event, Mr. Plait. *glare*