www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/big_bang/index.html
John Norton: "If the observer were to hurry towards the source of the light, the observer would now pass wavecrests more frequently than the resting observer. That would mean that moving observer would find the frequency of the light to have increased (and correspondingly for the wavelength--the distance between crests--to have decreased). That increase in frequency is a shifting of the light towards the blue end of the spectrum. The converse effect would happen if the observer were to recede from the light source. The light's frequency would diminish and the light would redden. For light, this effect depends only on the relative motion of observer and source. So if the observer were at rest and the light source moved, exactly the same thing would happen."
John Norton would have produced a revolutionary text if he had not used the variable wavelength camouflage. Here is the text without the camouflage:
"If the observer were to hurry towards the source of the light, the observer would now pass wavecrests more frequently than the resting observer. That would mean that moving observer would find the frequency of the light to have increased (AND CORRESPONDINGLY FOR THE SPEED OF THE LIGHT RELATIVE TO HIM TO HAVE INCREASED AS WELL). That increase in frequency is a shifting of the light towards the blue end of the spectrum. The converse effect would happen if the observer were to recede from the light source. The light's frequency would diminish and the light would redden. For light, this effect depends only on the relative motion of observer and source. So if the observer were at rest and the light source moved, exactly the same thing would happen."
Etherists do not use the variable wavelength camouflage and accordingly do produce revolutionary texts from time to time:
redshift.vif.com/JournalFiles/V17NO1PDF/V17N1GIF.pdf
Doppler Shift Reveals Light Speed Variation
Stephan J. G. Gift
Department of Electrical and Computer Engineering
The University of the West Indies
"Therefore the observed Doppler Shift or frequency change in the light or other electromagnetic radiation resulting from movement of the receiver toward the transmitter indicates a change in light speed relative to the moving receiver. (...) In conclusion, a change in radiation frequency or Doppler Shift occurs when an observer moving at speed v much lower than c towards or away from a stationary source intercepts electromagnetic waves from that source. This frequency change arises because the observer intercepts the electromagnetic radiation at a relative speed c ± v that is different from the light speed c. Though special relativity predicts the Doppler Shift, this light speed variation c ± v occurring in this situation directly contradicts the light speed invariance requirement of special relativity."
Pentcho Valev
pvalev@yahoo.com