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On This Day

  • 11-29-1803

    Christian Doppler, after whom the "Doppler effect" in acoustics and optics is named, was born in Salzburg, Austria. Primarily a mathematician, Doppler's greatest champion was Bernard Bolzano.

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    Christian Doppler
    Doppler Effect
    Bernard Bolzano
  • 11-29-1872

    Mary Somerville died in Naples, Italy. Her translation into English and expansion of Laplace's Mecanique Celeste (The Mechanism of the Heavens) in 1831 was well received. The 1842 edition of her next book posited a planet perturbing the orbit of Uranus and helped John Couch Adams discover Neptune.

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    Mary Somerville
    Pierre-Simon Laplace
    John Couch Adams
  • 11-29-1960

    Digital Equipment Corporation (DEC) announced the PDP-1, the first computer with a video display terminal.

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    DEC PDP-1