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Christian Doppler
Please vote to return to collections (Voting Results will appear on Right Sidebar).
    (November 29, 1803-March 17, 1853)
    Born in Salzburg, Austria
    Mathematician and physicist
    Namesake for the Doppler Effect: the change in frequency of a wave when the wave source moves relative to an observer
    Described in 'On the Colored Light of the Binary Stars' (1842)
    Example of the Doppler Effect: when a vehicle with a siren passes an observer, the siren is higher in pitch as the vehicle approaches, lower in pitch as it recedes
    His career was repeatedly interrupted by bouts of poor health.
    He found the wait for a teaching post so frustrating that he considered emigrating to the US; he had already visited the American consul in Munich to make the arrangements when he received an appointment.
    When he was teaching mathematics at the Vienna Polytechnic Institute, students complained that he was too harsh in his exams; he was reprimanded and the students were allowed to retake the tests (1844).
    An asteroid and a crater on the moon are named after him.
    He predicted that the Doppler Effect on the spectra of stars would be used by astronomers to determine the distances to the stars.
    Applications of the Doppler Effect range from the GPS navigation system to Major League Baseball's Statcast.

Credit: C. Fishel

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