Fait mathématique: 1937 is the number of digits of the 18^{th} perfect number.
Culture générale: 1937 is an unremarkable number.
Date historique: April 20th is the day in 1865 that Astronomer Pietro Angelo Secchi demonstrates the Secchi disk, which measures water clarity, aboard Pope Pius IX's yacht, the L’Immaculata Concezion.