Up to date, physics has neglected the crucial role of the relative velocity in the Doppler Effect. This is a small error in appearance, but it brings big problems to all of physics. Observed frequency is dependent only on the relative velocity between wavefronts and the wave source/observer. This new approach to the Doppler Effect finds application in all kinds of fields, when the source (observer) is moving.
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Shukri Klinaku (2019) studied this question.