Kepler's Laws<span>. Johannes </span>Kepler<span>, working with data painstakingly collected by Tycho Brahe without the aid of a telescope, developed three </span>laws<span> which described the motion of the </span>planets<span> across the sky. 1. The </span>Law<span>of </span>Orbits<span>: All </span>planets<span> move in elliptical </span>orbits<span>, with the sun at one focus</span>
