3900266 Portrait of William Herschel, The Astronomical Observatory "Giuseppe Piazzi", the Pisana Tower by Unknown artist, (18th-19th century); Palazzo dei Normanni, Palermo, Sicily, Italy; (add.info.: Frederick William Herschel (1738-1822): German-born British astronomer and composer. Palermo, The Royal Palace or Palazzo dei Normanni (Palace of the Normans), the Pisana Tower, The Astronomical Observatory "Giuseppe Piazzi": portrait of William Herschel, the astronomer who invented the The "Herschelian" catadioptric telescope, and who discovered the planet Uranus. Palermo, Palazzo Reale o Palazzo dei Normanni, Torre Pisana, Osservatorio Astronomico "Giuseppe Piazzi": ritratto di Guglielmo Herschel, inventore dell\'omonimo telescopio catadiottrico e scopritore del pianeta Urano.); Ghigo Roli; out of copyright.