F%C3%A9lix Tisserand
Franois Flix Tisserand was a French astronomer.
Tisserand was born at NuitsSaintGeorges, CtedOr. In 1863 he entered the cole Normale Suprieure, and on leaving he went for a month as professor at the lyce at Metz. Urbain Le Verrier offered him a post in the Paris Observatory, which he entered as astronome adjoint in September 1866. In 1868 he took his doctors degree with a thesis on Delaunays Method, which he showed to be of much wider scope than had been contemplated by its inventor. Shortly afterwards he went out to Kra Isthmus to observe the 1868 solar eclipse. He was part of a French expedition together with the douard Stephan and Georges Rayet. The French astronomers where accompanied by Mongkut, the King of Siam who had calculated the location and the date of the eclipse by himself two years before and prepared a comfortable watching place for the scientists.
Source: Wikipedia