Ever since early stargazers discovered that some heavenly bodies wandered among the others, people have been fascinated by the planets. Kepler calculated their orbits from naked-eye observations; Galileo’s telescope made it possible to discern their markings; now observations from spacecraft provide electronically enhanced images that bring these distant worlds even closer.
 
In Worlds in the Sky, William Sheehan gives us a history of this long fascination, weaving together scientific history, anecdotes surrounding planetary discoveries, and the personal reflections of an incurable amateur astronomer. He describes how we arrived at our current understanding of the Moon and the planets and shows how certain individuals in history shaped the world’s knowledge about the Solar System.

William Sheehan is an amateur astronomer, psychiatrist, and writer. He received a bachelor’s degree from the University of Minnesota, a master’s degree from the University of Chicago, and an MD degree from the University of Minnesota. He also completed residency training in psychiatry at the University of Minnesota. Sheehan’s first book, Planets and Perception: Telescopic Views and Interpretations, 1609–1909, was named a 1988 book f the year by the Astronomical Society of the Pacific. Dr. Sheehan has also published numerous articles in astronomy and psychiatry. His interest in the Moon and planets goes back to the early days of the spacecraft era, and he regularly observes with a six-inch refractor and a twelve-and-a-half-inch reflector from his home in St. Paul, Minnesota.