<P> Like the classical planets , Uranus is visible to the naked eye , but it was never recognised as a planet by ancient observers because of its dimness and slow orbit . Sir William Herschel announced its discovery on 13 March 1781 , expanding the known boundaries of the Solar System for the first time in history and making Uranus the first planet discovered with a telescope . </P>
when was uranus first discovered and by who
Sir William Herschel announced its discovery on 13 March 1781