Multiple choice Laws of planetary motion 1609-19 1609-34 1609-30 1609-20 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Johannes Kepler published his first two laws of planetary motion in 1609 in 'Astronomia Nova' and the third law in 1619 in 'Harmonices Mundi'. These laws described how planets orbit the sun in elliptical paths rather than perfect circles.