"The most common distinction made between the planets is “inner planets” versus outer “planets”. The term inner planets usually refers to the seven visual planets (although sometimes Jupiter and Saturn are not included in this list). This type of classification is very much a modern construct: before 1781, when Herschel discovered Uranus, there were only "inner" or "visible" planets—planets that were visible to the naked eye. (Of course the skies were a great deal clearer then). These included the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn. The outer planets are the planets that are only visible with a telescope: Uranus, Neptune and Pluto. The asteroid Chiron functions as a bridge between the inner and the outer planets....The fastest of the outer planets is Uranus which takes about 84 years to complete a cycle of the Zodiac. Today it is not unusual to see people to live past their Uranus return and humans are gradually developing a greater understanding of the energy of Uranus."