I'm pretty sure you're thinking of Johannes Kepler.
Johannes Kepler was responsible for the three laws of planetary motion, known as Kepler's Laws. These laws describe the motion and orbits of planets around the Sun.
Johannes Kepler is the German astronomer who devised the three laws of planetary motion in the seventeenth century. These laws describe the motion of planets in elliptical orbits around the Sun.
Tycho Brahe
The three laws of planetary motion, formulated by Johannes Kepler, describe the shape of planetary orbits as follows: Planets move in elliptical orbits with the Sun at one of the foci. A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
It gave a strong proof of heliocentric saying earth revolves around the sun and not vice-versa.
Johannes Kepler was responsible for the three laws of planetary motion, known as Kepler's Laws. These laws describe the motion and orbits of planets around the Sun.
Kepler
According to Kepler's laws of planetary motion, planetary orbits are in the shape of an ellipse with the Sun at one of the foci.
Johann Kepler
Johannes Kepler
Johannes Kepler
Silicon Sandy
Sir Isaac Newton was the first to develop the three laws of motion.
No. Kepler discovered the laws using Tycho Brahe's data.
Johannes Kepler is the German astronomer who devised the three laws of planetary motion in the seventeenth century. These laws describe the motion of planets in elliptical orbits around the Sun.
Mindboggling? They are "Laws of Planetary Motion". So I guess the answer is "motion".
Isaac newton discovered the three principles of planetary motion