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Bernard Ferdinand Lyot (27 February 1897, in Paris – 2 April 1952, in Cairo) was a French astronomer.

His interest in astronomy started in 1914. He soon acquired a 4-inch (100 mm) telescope and soon upgraded to a 6-inch (150 mm). From graduation in 1918 until 1929, he worked as a demonstrator at the École Polytechnique and studied engineering, physics, and chemistry at the University of Paris.