Galileo explains his ideas on astronomy and observation to a young boy. He demonstrates his understanding of the heliocentric theory by moving the boy around a washbowl to show that he may observe the washbowl in a new place when he in fact is the one moving.
What is modeled by the device?
What moment does Galileo pinpoint as a change in thinking?
How does Galileo demonstrate his idea of a sun-centered system?