Today marks the birth of 18th-century astronomer Frederick William Herschel. Born November 15, 1738, Herschel made many discoveries during his lifetime. Most notable among his contributions to astronomy include determining the shape of the Milky Way, determining the rotation period of Saturn's rings, and sketching changes in Jupiter's atmosphere. Discoveries Mars and Jupiter show axial rotation Planet Uranus (1781) Uranus's two largest...