The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because
A) the Copernican system used the old value for the radius of Earth.
B) Copernicus had been unable to detect parallax.
C) the Copernican system used uniform circular motion like Ptolemy.
D) in the Copernican system only Mercury and Venus orbit the sun,all other planets orbited Earth.
E) Copernicus used inaccurate data from Ptolemy's system.

Question

Quizplus · Accepted Answer

The Copernican system, like the Ptolemaic system, used uniform circular motion, which did not accurately reflect the elliptical orbits of planets, leading to similar inaccuracies in predicting planetary positions.

The Copernican System Was No More Accurate Than the Ptolemaic