Guillaume Bigourdan
Camille Guillaume Bigourdan was a French astronomer.
Bigourdan was born at Sistels, TarnetGaronne to Pierre Bigourdan and Jeanne Carrire. In 1877 he was appointed by Flix Tisserand as assistant astronomer at the Toulouse Observatory, and in 1879 followed Tisserand to the Paris Observatory when the latter became director there.
Source: Wikipedia