%0 Video %T Philosophy 167: Class 5 - Part 6 - Letters on Sunspots: the Phases of Venus, and the Demise of Ptolemaic Astronomy. %A Smith, George E. (George Edwin), 1938- %D 2015-09-03T13:34:13.273Z %8 2015-09-03 %I Tufts Archival Research Center %R http://localhost/files/dj52wh11d %X 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."; Duration: 12:34 minutes.; Segment: Class 5, Part 6. %G eng %[ 1972-12-31 %9 Video %~ Tufts Digital Library %W Institution