Louis Bertrand Castel, French mathematician and philosopher (died 1757)

Louis Bertrand Castel was a French mathematician born in Montpellier, who entered the order of the Jesuits in 1703. Having studied literature, he afterwards devoted himself entirely to mathematics and natural philosophy. After moving from Toulouse to Paris in 1720, at the behest of Bernard de Fontenelle, Castel acted as the science editor of the Jesuit Journal de Trévoux.

November 5 is the 309th day of the year in the Gregorian calendar; 56 days remain until the end of the year.