Template:Selected anniversaries/June 21
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1652: Architect Inigo Jones dies. He was one of the first architects of the early modern period to employ Vitruvian rules of proportion and symmetry in his buildings.
1781: Mathematician and physicist Siméon Denis Poisson born. His memoirs on the theory of electricity and magnetism will constitute a new branch of mathematical physics.
1948: Biologist, mathematician, and classics scholar D'Arcy Wentworth Thompson dies.