The early Copernican system for planetary motions is
A) Earth-centered,with planets,the Sun,and the stars moving in perfect circles.
B) Earth-centered,with planets moving in epicycle patterns around Earth.
C) Sun-centered,with planets moving in perfect circles around the Sun.
D) Sun-centered,with planets moving in elliptical orbits,the Sun being at one focus of the ellipse.

Question

Quizplus · Accepted Answer

The early Copernican system was Sun-centered (also known as heliocentric) with planets moving in perfect circles around the Sun. This was a departure from the earlier Ptolemaic system, which was Earth-centered (also known as geocentric) and had planets moving in epicycle patterns around Earth. It wasn't until Johannes Kepler's work in the early 17th century that it was discovered that planets actually move in elliptical orbits, with the Sun at one focus of the ellipse.

The Early Copernican System for Planetary Motions Is