Learning Objective: Explore Kepler's three laws of planetary motion through interactive elliptical orbits, equal-area sweeping, and the period–distance relationship.
0.500 AU
Perihelion
1.500 AU
Aphelion
1.00 yr
Period
Kepler's Second Law: A line joining a planet and the Sun sweeps out equal areas in equal intervals of time. Planets move faster when closer to the Sun.