Harmony of the Worlds is the third episode of Cosmos A Personal Voyage. It first aired 12 October 1980 on PBS.
Summary[]
Beginning with the separation of the fuzzy thinking and pious fraud of astrology from the careful observations of astronomy, Carl Sagan follows the development of astronomical observation. From constellations and ceremonial calendars, such as those of the Anasazi, the story moves to the debate between Earth and Sun-centered models: Ptolemy and the geocentric worldview, Copernicus' theory, the data-gathering of Tycho Brahe, and the achievements of Johannes Kepler, including his laws of planetary motion and the first science-fiction novel.