Summarize the most important telescopic evidence that Galileo offered for the Copernican theory. How
did this evidence confirm that theory? (For example, which of these pieces of evidence were inconsistent
with the Ptolemaic model? If they were compatible with the Ptolemaic model, how did they nevertheless
disconfirm that model?) What was the Tychonic model? How does it compare to the Copernican model –
on what points do they agree and on what points do they disagree? How did Galileo’s telescopic evidence
(which you summarized earlier) agree or disagree with it? How might Galileo have argued against the
Tychonic model and what general lessons about theory testing can be drawn from this example?