Kepler's laws of planetary motion law" is what became the Second Law in the set of three; but Kepler did himself not privilege it in that way. Johannes Kepler published his first two laws about planetary motion in 1609, having found them by analyzing the astronomical observations of Tycho Brahe. Kepler's third law was published in 1619. Kepler had believed in the Copernican model of the solar system, which called for circular orbits, but he could not reconcile Brahe's highly precise observations with a circular fit to Mars' orbit—Mars coincidentally having the highest eccentricity of all planets except Mercury. His first law reflected this discovery.
Stars and planetary systems in fiction with most writers of his era, his settings did not extend beyond the Solar System, and so his work is not found in this article. Planetary systems (mostly hypothetical or imaginary) of real stars appearing in fiction are: In 2011 three Super-Earths were confirmed in orbit around 82 Eridani (HD20794). Barnard's Star is a red dwarf of apparent magnitude 9 and is thus too dim to be seen with the unaided eye. However, at approximately 6 light-years away it is the second-closest stellar system to the Sun; only the Alpha Centauri system is known to be closer. Thus, even though