Template:On This Day (nonfiction)/May 25

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  • 986: Astronomer Abd al-Rahman al-Sufi dies.

    986: Astronomer Abd al-Rahman al-Sufi dies.

  • 1555: Physician, mathematician, and cartographer Gemma Frisius dies. He created important globes, improved the mathematical instruments of his day, and applied mathematics to surveying and navigation in new ways.

    1555: Physician, mathematician, and cartographer Gemma Frisius dies. He created important globes, improved the mathematical instruments of his day, and applied mathematics to surveying and navigation in new ways.

  • 1828: Mathematician Karl Mikhailovich Peterson born. He will discover equations which will subsequently be named the Gauss–Codazzi equations, fundamental to the theory of embedded hypersurfaces in a Euclidean space.

    1828: Mathematician Karl Mikhailovich Peterson born. He will discover equations which will subsequently be named the Gauss–Codazzi equations, fundamental to the theory of embedded hypersurfaces in a Euclidean space.

  • 1889: Aircraft designer Igor Sikorsky born. He will pioneer both helicopters and fixed-wing aircraft.

    1889: Aircraft designer Igor Sikorsky born. He will pioneer both helicopters and fixed-wing aircraft.

  • 1961: Apollo program: U.S. President John F. Kennedy announces before a special joint session of the Congress his goal to initiate a project to put a "man on the Moon" before the end of the decade.

    1961: Apollo program: U.S. President John F. Kennedy announces before a special joint session of the Congress his goal to initiate a project to put a "man on the Moon" before the end of the decade.

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