Template:Selected anniversaries/April 30

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  • 1523: Mathematician and cartographer Oronce Finé uses Judicial astrology (nonfiction) to detect and prevent crimes against astronomical constants.

    1523: Mathematician and cartographer Oronce Finé uses Judicial astrology (nonfiction) to detect and prevent crimes against astronomical constants.

  • 1777: Mathematician, astronomer, and physicist Carl Friedrich Gauss born. He will have an exceptional influence in many fields of mathematics and science and be ranked as one of history's most influential mathematicians.

    1777: Mathematician, astronomer, and physicist Carl Friedrich Gauss born. He will have an exceptional influence in many fields of mathematics and science and be ranked as one of history's most influential mathematicians.

  • 1874: Scene from Gambling Den Fight adapted for opera by John Havelock, performed at theaters across Europe to rave reviews.

    1874: Scene from Gambling Den Fight adapted for opera by John Havelock, performed at theaters across Europe to rave reviews.

  • 1897: J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.

    1897: J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.

  • 1905: Albert Einstein writes his thesis Eine neue Bestimmung der Moleküldimensionen ("A New Determination of Molecular Dimensions").

    1905: Albert Einstein writes his thesis Eine neue Bestimmung der Moleküldimensionen ("A New Determination of Molecular Dimensions").

  • 1916: Mathematician, engineer, and information scientist Claude Shannon born. He will be known as "the father of information theory".

    1916: Mathematician, engineer, and information scientist Claude Shannon born. He will be known as "the father of information theory".

  • 1916: Jazz drummer and theoretical physicist Albert Einstein stops the Forbidden Ratio from kidnapping newborn infant Claude Shannon.

    1916: Jazz drummer and theoretical physicist Albert Einstein stops the Forbidden Ratio from kidnapping newborn infant Claude Shannon.

  • 1973: Watergate: U.S. President Richard Nixon announces that White House Counsel John Dean has been fired and that other top aides, most notably H. R. Haldeman and John Ehrlichman, have resigned.

    1973: Watergate: U.S. President Richard Nixon announces that White House Counsel John Dean has been fired and that other top aides, most notably H. R. Haldeman and John Ehrlichman, have resigned.

  • 2018: Chromatographic analysis of Green Sprouts unexpectedly reveals "at least thirty-five kilobytes" of encrypted data, apparently a previously unknown Gnomon algorithm function related to the color green.

    2018: Chromatographic analysis of Green Sprouts unexpectedly reveals "at least thirty-five kilobytes" of encrypted data, apparently a previously unknown Gnomon algorithm function related to the color green.

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