Template:Selected anniversaries/April 4

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  • 1807: Astronomer, freemason, and writer Joseph Jérôme Lefrançois de Lalande dies. As a lecturer and writer Lalande helped popularize astronomy. His planetary tables were the best available up to the end of the 18th century.

    1807: Astronomer, freemason, and writer Joseph Jérôme Lefrançois de Lalande dies. As a lecturer and writer Lalande helped popularize astronomy. His planetary tables were the best available up to the end of the 18th century.

  • 1826: Electrical engineer Zénobe Gramme born. He will invent the first usefully powerful electric motor.

    1826: Electrical engineer Zénobe Gramme born. He will invent the first usefully powerful electric motor.

  • 1842: Mathematician Édouard Lucas born. He will study the Fibonacci sequence; the related Lucas sequences and Lucas numbers will be named after him.

    1842: Mathematician Édouard Lucas born. He will study the Fibonacci sequence; the related Lucas sequences and Lucas numbers will be named after him.

  • 1901: Charles Hermite publishes paper on number theory as deterrent to crimes against mathematical constants.

    1901: Charles Hermite publishes paper on number theory as deterrent to crimes against mathematical constants.

  • 1923: Mathematician and philosopher John Venn dies. He invented the Venn diagram, now widely used set theory, probability, logic, statistics, and computer science.

    1923: Mathematician and philosopher John Venn dies. He invented the Venn diagram, now widely used set theory, probability, logic, statistics, and computer science.

  • 1976: Engineer and theorist Harry Nyquist dies. He did early theoretical work on determining the bandwidth requirements for transmitting information, laying the foundations for later advances by Claude Shannon, which led to the development of information theory.

    1976: Engineer and theorist Harry Nyquist dies. He did early theoretical work on determining the bandwidth requirements for transmitting information, laying the foundations for later advances by Claude Shannon, which led to the development of information theory.

  • 1977: Dave the Gamer announces "buy one, get one free" sale on all lucky dice in the store.

    1977: Dave the Gamer announces "buy one, get one free" sale on all lucky dice in the store.

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