Kepler used Tycho's observations to show that the planets
A)followed perfectly circular orbits.
B)followed perfectly cubical orbits.
C)all circled the Earth.
D)followed elliptical orbits.

Question

Quizplus · Accepted Answer

Kepler used Tycho's observations to show that the planets followed elliptical orbits, which was a significant departure from the previous belief that they followed perfectly circular orbits.

Kepler Used Tycho's Observations to Show That the Planets