Philosophy 167: Class 5 - Part 6 - Letters on Sunspots: the Phases of Venus, and the Demise of Ptolemaic Astronomy.
Smith, George E. (George Edwin), 1938-
2014-09-30
Description
Synopsis: Discusses Galileo's Letters on Sunspots, in which he publishes his observations of sunspots and the phases of Venus, implying that Venus orbits the Sun.
Opening line: "In the letters on sunspots, there are various points I'll come back to the others."