<P> 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 . Notably , Kepler had believed in the Copernican model of the solar system , which called for circular orbits , but 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 . </P>
<P> 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 . Notably , Kepler had believed in the Copernican model of the solar system , which called for circular orbits , but 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 . </P>
who discovered the three laws of planetary motion
who discovered the three laws of planetary motion
Johannes Kepler
Johannes Kepler