While others before him, like Nicolaus Copernicus, had proposed a heliocentric model of the solar system, it was Kepler who, through meticulous observations and calculations based on Tycho Brahe's data, formulated the three laws of planetary motion:
1. The Law of Ellipses: Planets move in elliptical orbits with the Sun at one focus.
2. The Law of Areas: A line joining a planet to the Sun sweeps out equal areas in equal times.
3. The Law of Periods: The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.
These laws, particularly the first one, revolutionized our understanding of planetary motion and laid the groundwork for Isaac Newton's later work on universal gravitation.
