Venus In Transit by Eli Maor. 2004, ISBN 0-691-11589-3. This book is about astronomy, in particular the transit of Venus. The planet Venus has been known to man since ancient times, because it is visible to the naked eye. Venus is one of the seven wanderers (Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn.) However, the transit of Venus wasn't seen by man (as far as anyone knows) or even imagined until mathematical astronomy predicted that it should happen. Once people knew that this should happen they started looking for it and it was first observed in England by Jeremiah Horrocks on 24 November 1639. This book tells the story of how the transit of Venus was predicted and the various attempts at viewing it. (Note: the next transit of Venus will be on June 6, 2012. After that it doesn't occur again until the year 2117.) Like his other books, I found this book enjoyable to read. It even has a little bit of trigonometry when explaining what the scientists were trying to do by viewing the transit (measuring the distance to the sun, etc.) See parallax and parsec. I purchased this book from Shell Creek Books, on 3-20-2011, for 6.99.