Richard Berendzen is professor of physics at American University in Washington, D.C.

The earliest thinkers about the heavens were navigators who guided ships and caravans by the stars; philosophers who mused on man's place in nature and theologians who sought the throne of God. In time, astronomers would add to, refine and challenge our earliest concept of the Heavens in ways that tested the boundaries between religion, science, and philosophy. In the second program of his two-part history of the heavens, Richard Berendzen discusses the great thinkers who have advanced our understanding of the cosmos.