In dictionaries:
the doppler effect
Change in frequency due to motion.
Relativistic Doppler effect
The relativistic Doppler effect is the change in frequency, wavelength and amplitude Extract of page 22 of light, caused by the relative motion of the source and the observer (as in the classical Doppler effect, first proposed by Christian Doppler in 1842), when taking into account effects described by the special theory of relativity.
astronomical doppler effect
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