Jean-Baptiste Biot

Jean-Baptiste Biot was a French physicist, astronomer, and mathematician who co-discovered the Biot–Savart law of magnetostatics with Félix Savart, established the reality of meteorites, made an early balloon flight, and studied the polarization of light.

21 April 1774

Born on the same birth day (21 April): Diana Darvey • Elizabeth II • Estella B. Diggs • Gary Peters (baseball) • Herbert Wetterauer • Michael Zarnock • Patti LuPone • Paul Davis (singer) • Romeo Bertini • Steve Vickers (ice hockey) • Tatu Kolehmainen

Born in the same month (April 1774): Christian Leopold von Buch