
Johannes Kepler (27 December 1571 – 15 November 1630) was a German mathematics teacher, astronomer, optician, natural philosopher, astrologer and Lutheran theologian.
He was Tycho Brahe's apprentice. Tycho Brahe looked at the way the planets moved in the sky. Johannes Kepler found a simple way to say how the planets move. Kepler also studied other things like Kepler's supernova.