As light speed c varies with emitter velocity v,
c(v)=c+v
Frequency f = c/wavelenth el
From static emitter f = c/el
From moving emitter f(v) = (c+v)/el
The Doppler freqyency shift is f(v)-f = v/el
Note: no need for twisting up wavelength in all dtrections with variant
light speed.
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