Siméon Denis Poisson

Baron Siméon Denis Poisson FRS FRSE was a French mathematician and physicist who worked on statistics, complex analysis, partial differential equations, the calculus of variations, analytical mechanics, electricity and magnetism, thermodynamics, elasticity, and fluid mechanics. Moreover, he predicted the Arago spot in his attempt to disprove the wave theory of Augustin-Jean Fresnel.

21 June 1781

Born on the same birth day (21 June): Allyssa DeHaan • Brian Simmons • Dejan Ognjanović • Derek Emslie, Lord Kingarth • Diane Marleau • Fernando Savater • Hideaki Wakui • Jean Chacornac • John Agard • John Dollond • Jussie Smollett • Robert A. Boyd • Robert Dewar • Trygve Thue • Wilhelm Küchelbecker • William Edwin Self • Ya'acov Ben-Dov • Zlatko Grgić

Born in the same month (June 1781): Christian Lobeck • George Stephenson