November 20, 1934

1934Paco Ibáñez, Spanish singer and musician^[†]

Francisco "Paco" Ibáñez is a Spanish singer and musician. He never composed his own lyrics, but used famous poems, like those of Federico García Lorca, Luis Cernuda, Rafael Alberti or Miguel Hernández. He also sang compositions from Georges Brassens.

1934Lev Polugaevsky, Soviet Chess Grandmaster (died 1995)^[†]

Lev Abramovich Polugaevsky was a Soviet chess player. He was awarded the title of International Grandmaster by FIDE in 1962 and was a frequent contender for the World Championship, although he never achieved that title. He was one of the strongest players in the world from the early 1960s until the late 1980s, as well as a distinguished author and opening theorist whose contributions in this field remain important to the present day.

1934Willem de Sitter, Dutch mathematician, physicist, and astronomer (born 1872)^[†]

Willem de Sitter was a Dutch mathematician, physicist, and astronomer. He is known for the de Sitter universe, which is a cosmological model that was named after him.