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Astro*Dictionary by Michael Erlewine





2 articles for "Doppler"

Doppler Effect [Astro*Index]

Also called Doppler shift.

Apparent change in wavelength of a star's radiation due to its relative motion toward or away from an observer. When the distance is increasing, the lines of the spectrum are displaced toward the red; when decreasing, displaced toward the violet. The change in wavelength is given by: dL = (v/c) x L.

See also:
♦ Light Spectrum ♦ Fizeau, Armand Hippolyte Louis ♦ Wave Length
Doppler, Christian Johann [Astro*Index]


(1803-1853) Austrian physicist.

Born at Salzburg; died at Venice. Best-known for his discovery, in 1842, of the Doppler Effect for sound. He predicted a similar effect for light waves which, after correction by Fizeau, has played a major role in astronomy.

See also:
♦ Fizeau, Armand Hippolyte Louis


Astro*Index Copyright © 1997 Michael Erlewine