uranus88Snificant Events. March 13, 1781: British astronomer William Herschel discovers Uranus – the first new planet discovered since ancient times – while searching for faint stars. 1787-1851: Four Uranian moons are discoveredThe following out is provided as an overview of and topical guide to Uranus: . Uranus – seventh planet from the Sun.It has the third-largest planetary radius