Johannes Kepler

Johannes Kepler (1571-1630), was a mathematician and astronomer best known for his work on the motion of planets. He made significant contributions to our understanding of celestial mechanics. Kepler formulated three laws of planetary motion known as Kepler’s Laws:
- Kepler’s First Law (Law of Ellipses): Planets move in elliptical orbits with the sun at one of the two foci.
- Kepler’s Second Law (Law of Equal Areas): A line segment joining a planet and the sun sweeps out equal areas in equal intervals of time, meaning that planets move faster when they are closer to the sun in their orbits.
- Kepler’s Third Law (Law of Harmonies): The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. His laws laid the foundation for Isaac Newton’s later work on universal gravitation.