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On This Day

  • 4-21-1552

    Petrus Apianus (Peter Apian) died in Bavaria. The astronomer and geographer published very accurate sine tables.

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    Petrus Apianus
    Sine tables of Apianus
  • 4-21-1652

    Michel Rolle born in France. His favorite area of research was the theory of equations. He introduced the symbol we use for nth roots, but is most famous for Rolle's Theorem in calculus.

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    Michel Rolle
  • 4-21-1692

    David Gregory delivered his inaugural lecture as Savilian professor of astronomy at Oxford. He received his post on the recommendation of Newton.

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    David Gregory
    Isaac Newton

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