Which of these observations of Galileo refuted Ptolemy's epicycles?
A) the complete cycle of Venus' phases
B) the rotation of sunspots across the Sun's surface
C) the revolution of Jupiter's moons around it
D) the craters on the Moon
E) the visibility of many more stars with the telescope

Question

Quizplus · Accepted Answer

Galileo's observation of the complete cycle of Venus' phases demonstrated that Venus orbits the Sun, not Earth, contradicting the Ptolemaic model which could not account for the full set of phases.

Which of These Observations of Galileo Refuted Ptolemy's Epicycles