The relativistic Doppler effect is the change in frequency (and wavelength) of light, caused by the relative motion of the source and the observer (as in the classical Doppler effect), when taking into account effects described by the special theory of relativity.
The relativistic Doppler effect is different from the non-relativistic Doppler effect as the equations include the time dilation effect of special relativity and do not involve the medium of propagation as a reference point. They describe the total difference in observed frequencies and possess the required Lorentz symmetry.
Read more about Relativistic Doppler Effect: Visualization, Analogy, Motion Along The Line of Sight, Systematic Derivation For Inertial Observers, Transverse Doppler Effect, Motion in An Arbitrary Direction, Accelerated Motion
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