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Triton
Neptune's largest moon. It was discovered in 1846 by British astronomer and beer brewer, William Lassell, and thought to be Neptune's only moon until Nereid was discovered in 1949. Triton is Neptune's only spherical moon with a diameter of 2,707 kilometres. It orbits at a distance of 354,800 kilometres (220,462 miles) taking 5 days and 21 hours to complete an orbit.
 
William Herschel, who, among other things, identified Uranus as a planet rather than a star, and was appointed Court Astronomer by George III.