The average book on astronomy contents itself with a much less ambitious program than this one. Stokley, in five or six chapters, covers thoroughly -- and adequately -- material which has inspired many books. Intended for the layman, and so arranged that at no point is material introduced which will befuddle the beginner, he employs many original comparisons to make the going easier. The great mass of data recommends it to the reader who follows the text carefully. The constellations -- the motions of the earth and sun -- the history of the development of the science -- telescopes -- time -- the solar system -- the stars --the Milky Way Galaxy -- the spiral -- the question of life on the planets. The author who is director of the Fels Planetarium, Philadelphia, is not a brilliant writer, he merely presents the facts, and rarely plays up the sensational in preference to the academic details. A valuable reference book for the amateur astronomer.