Philosophy 167: Class 11 - Part 12 - The Eclipses of Io: Cassini and the Speed of Light.
Smith, George E. (George Edwin), 1938-
2014-11-18
Description
Synopsis: Observations of eclipses of Io caused the first speculation that planetary observations must be corrected for a measurable speed of light. Cassini resisted this idea for a long time.
Opening line: "The tables were saying the eclipse should happen at a certain time, and the kind of error was eight minutes in time."
