Colorful illustrations and clear easy-to-read text give this revised edition more appeal than the 1974 edition. The completely rewritten text is better organized with less repetition. It includes less descriptive information about the four seasons and places more emphasis on the causes of seasonal changes. A simply stated and carefully illustrated experiment using an orange, a pencil and a flashlight to help children actually see the differences on earth caused by the tilt of the earth as it rotates on its axis and revolves around the sun is particularly useful. A worthwhile addition, along with the 1974 edition and Berger's Time After Time (Coward, 1975; o.p.). For younger children, Gibbons' Sun Up, S un Down (HBJ, 1983) is a better introduction.Eunice Weech, M. L. King Elementary School, Urbana, Ill. Copyright 1986 Reed Business Information, Inc.