Question

in addition to proposing that planetary orbits are elliptical, what other modification did kepler make to copernicus’s 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.
earth’s rotation causes the rising and setting of the sun.

Explanation:

Kepler's second law (law of equal - areas) states that a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. This implies that planets closer to the Sun move faster. Copernicus' model did not have this aspect. The other options are either incorrect (planets spin in an epicycle while orbiting Earth is part of the Ptolemaic model), or not a modification by Kepler to Copernicus' model (Venus phases was known before Kepler and Earth's rotation causing Sun's rising/setting was part of Copernicus' heliocentric view).

Answer:

Planets closer to the Sun move faster.