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Christian Andreas Doppler was an Austrian mathematician and physicist. He is celebrated for his principle — known as the Doppler effect — that the observed frequency of a wave depends on the relative speed of the source and the observer. He used this concept to explain the color of binary stars.
Born: November 29, 1803, Salzburg, Austria
Italy Full name: Christian Andreas Doppler
Education: University of Vienna (1829),
Vienna University of Technology (1822–1825),
Czech Technical University in Prague
Children: Matilda Doppler, Hermann Doppler, Bertha Doppler, Adolf Doppler, Ludwig Doppler