Kepler found the orbits of planets are ellipses, not circles.

Name: Kepler found the orbits of planets are ellipses, not circles.
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Kepler's first law, also known as the law of ellipses, states that the orbit of each planet around the Sun is an ellipse with the Sun at one focus of the ellipse. Kepler's first law of planetary motion states that the orbits of planets are ellipses, with the sun at one of the foci.

Kepler Found the Orbits of Planets Are Ellipses, Not Circles