The text retains the readability of the famous 19th century original and has been completely updated by an international group of experts. 672 pages with nearly 1000 photographs explains the price. The book is divided into eight sections covering: The Earth, The Moon, The Sun, The Planets, Comets, Meteors and Meteorites, The Sidereal Universe, The Instruments of Astronomy and Artificial Satellites and Space Vehicles. Some Astronomical Facts and Data"" is four handy pages of the various figures pertaining to weights and measures, rotation periods, etc., of the planets and satellites.