He was a German astronomer who lived from 1571 to 1630. Kepler built upon the work of Nicolaus Copernicus, who proposed the heliocentric model of the solar system (the sun at the center). Kepler studied the observations of Tycho Brahe, a meticulous Danish astronomer, and formulated his three laws of planetary motion:
1. Law of Ellipses: Planets move in elliptical orbits, with the sun at one focus.
2. Law of Areas: A line joining a planet and the sun sweeps out equal areas in equal times.
3. Law of Periods: The square of a planet's orbital period is proportional to the cube of its average distance from the sun.
Kepler's laws revolutionized our understanding of planetary motion, replacing the old, inaccurate model of circular orbits with a more accurate and elegant description of the universe.
