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Bouvard's achievements included the discovery of eight comets and the compilation of astronomical tables of Jupiter, Saturn and Uranus. While the former two tables were eminently successful, the latter showed substantial discrepancies with subsequent observations. This led Bouvard to hypothesise the existence of an eighth planet responsible for the irregularities in Uranus' orbit. The position of Neptune was subsequently calculated, independently, by John Couch Adams and Urbain Le VerrierUrbain Jean Joseph Le Verrier ( March 11, 1811 September 23, 1877) was a French mathematician who specialized in celestial mechanics. He worked at the Paris Observatory for most of his life. He was born in Saint-Lo, France. His most famous achievement is after his death.

Bouvard was director of the Paris ObservatoryThe Paris Observatory (in French, Observatoire de Paris or Observatoire de Paris-Meudon is the foremost astronomical observatory of France, and one of the largest astronomical centers in the world. Administratively, it is a "great establishment" of the mi. He died in ParisEiffel Tower has become the symbol of Paris throughout the world. Paris is the capital and largest city of France. The city is built on an arc of the River Seine, and is thus divided into two parts: the Right Bank to the north and the smaller Left Bank to.