books.google.co.uk - The Ever-Changing Sky provides a comprehensive and uniquely non-mathematical guide to spherical astronomy. In a clear and lucid text, the reader is guided through terrestrial and celestial co-ordinate systems, time measurement and celestial navigation, on to the stars and constellations (with useful...http://books.google.co.uk/books/about/The_Ever_Changing_Sky.html?id=KYLSMsduNqcC&utm_source=gb-gplus-shareThe Ever-Changing Sky
