Their father, William Marshall Smart, was John Couch Adams Astronomer at Cambridge University and later Regius Professor of Astronomy at Glasgow.
He served in the Royal Navy during World War I as an instructor in navigation (RN College Greenwich 1915, HMS Emperor of India 1916–19) and then returned to Cambridge in 1919 as a lecturer in Mathematics and John Couch Adams Astronomer (1921–1937).
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