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On This Day

  • 6-15-1640

    Bernard Lamy born in Le Mans, France. He was temporarily silenced by the Church for his Cartesianism, but later wrote about mechanics, geometry, and perspective in painting.

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    Bernard Lamy
    Rene Descartes

  • 6-15-1752

    Benjamin Franklin kite experiment. Franklin demonstrated that lightning contains electricity by means of a kite.

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    Benjamin Franklin
    Benjamin Franklin's experiment

  • 6-15-1894

    Nikolai Chebotaryov born in Ukraine. He proved a density theorem generalizing Dirichlet's theorem on primes in an arithmetic progression in 1922 and translated or wrote many of the first advanced algebra texts in Russian.

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    Nikolai Chebotaryov
    Lejeune Dirichlet

  • 6-15-763 BCE

    Assyrians recorded a solar eclipse that was used to fix the chronology of ancient Mesopotamian history.

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    Assyrian Eclipse of 763 BCE