An elliptical orbit is a celestial body’s path that has an oval shape. Kepler first went defining the shape of these planetary orbits through his law of planetary motion. He explained about the elliptical shape of orbits in which the planets of our solar system have been moving. Kepler also gave a measurement of elliptical shape in terms of the ellipse’s eccentricity. More eccentricity means more elongation of the ellipse. However, Kepler did not try to explain the reason of planets moving in elliptical orbits. His groundwork was later used a research base by other physicists who explained this phenomena.
