401 years ago #today (May 15, 1618) Johannes Kepler discovered the simple mathematical rule governing the orbits of the solar system’s planets, now recognized as Kepler’s Third Law of planetary motion. This is his house in Linz, Austria https://t.co/oje6MDQ858 pic.twitter.com/XaB71sVmK0

— Massimo (@Rainmaker1973) May 15, 2019