Copernicus' model explained the retrograde motion of a planet by:
A. having it orbit at a different speed than Earth's orbit around the sun.
B. moving it on a circle that itself moves around Earth.
C. using elliptical instead of circular orbits.
D. disregarding parallax.
Answer:A
Copernicus' model explained the retrograde motion of a planet by:
A. having it orbit at a different speed than Earth's orbit around the sun. B. moving it on a circle that itself moves around Earth. C. using elliptical instead of circular orbits. D. disregarding parallax.