Question

in addition to proposing that planetary orbits are elliptical, what other modification did kepler make to copernicuss model?
planets closer to the sun move faster.
planets spin in an epicycle while orbiting earth.
venus has phases due to its orbiting of the sun.
earths rotation causes the rising and setting of the sun.

Explanation:

Copernicus's model used circular orbits with uniform planetary motion. Kepler's laws modified this: his second law states a planet's orbital speed increases as it nears the Sun. The other options are either part of Ptolemy's geocentric model, Galileo's observations, or already part of Copernicus's heliocentric model.

Answer:

A. Planets closer to the Sun move faster.