Question

in addition to proposing that planetary orbits are elliptical, what other modification did kepler make to copernicuss model?
plans 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:

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 incorrect as planets orbit the Sun (not Earth in an epicycle as in the Ptolemaic model), the phases of Venus being due to its orbit around the Sun was known before Kepler and related to Galileo's observations in part, and the idea of Earth's rotation causing the Sun's rising and setting was part of Copernicus' heliocentric model.

Answer:

Plans closer to the Sun move faster.