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On This Day

  • 2-19-1473

    Astronomer Nicolaus Copernicus born in Torun, Poland. In his De revolutionibus, he would place the sun at the center at the universe with the earth rotating around it.

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    Nicolaus Copernicus
  • 2-19-1549

    Osiander wrote of Michael Stifel: "He has devised new numbers for the alphabet, namely the triangular numbers, and his fantasies are more absurd than before."

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    Michael Stifel
    Andreas Osiander
  • 2-19-1672

    Newton's first publication appeared as a letter in the Philosophical Transactions. It dealt with his new theory of light, showing that a prism separates white light into its component colors. Huygens, Hooke, and others objected so strongly that he vowed not to publish again. Fortunately that vow was not kept.

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    Isaac Newton
    Robert Hooke
    Christiaan Huygens
  • 2-19-1876

    J. J. Sylvester began his duties at the newly founded Johns Hopkins University in Baltimore, Maryland.

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    James Joseph Sylvester

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