A light source emits equidistant pulses and an observer starts moving towards the source:

https://youtube.com/watch?v=bg7O4rtlwEE

The speed of the light pulses relative to the stationary observer is

c = df

where d is the distance between subsequent pulses and f is the frequency at the stationary observer. The speed of the pulses relative to the moving observer is

c'= df' > c

where f' > f is the frequency at the moving observer.

That is, the speed of light relative to the observer VARIES with the speed of the observer.

Einstein's relativity can only be saved if we assume that the motion of the observer changes d, the distance between subsequent pulses, so that the speed of light relative to the observer can gloriously remain constant. This is a preposterous ad hoc
assumption, so preposterous that even the Einstein Cult explicitly rejects it (without knowing the consequences of the rejection):

Max Planck Institute for Gravitational Physics: "You can see for yourself that, once more, there is a blue-shift - the pulse frequency measured at the receiver is somewhat higher than the frequency with which the pulses are sent out. This time, THE
DISTANCES BETWEEN SUBSEQUENT PULSES ARE NOT AFFECTED, but still there is a frequency shift." https://www.einstein-online.info/en/spotlight/doppler/

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"In astrophysics, gravitational redshift or Einstein shift is the process by which electromagnetic radiation originating from a source that is in gravitational field is reduced in frequency, or redshifted, when observed in a region of a weaker
gravitational field. This is a DIRECT RESULT OF GRAVITATIONAL TIME DILATION." https://educalingo.com/en/dic-en/einstein-shift

A blatant lie universally taught in Einstein's schizophrenic world. The gravitational redshift (or blueshift) is a direct result of the variation of the speed of light as predicted by Newton's theory. In a gravitational field, the speed of light varies
like the speed of ordinary projectiles, and the frequency varies proportionally. This is so obvious that even Einsteinians confirm it sometimes:

Max Planck Institute for Gravitational Physics : "You do not need general relativity to derive the correct prediction for the gravitational redshift. A combination of Newtonian gravity, a particle theory of light, and the weak equivalence principle (
gravitating mass equals inertial mass) suffices...The gravitational redshift was first measured on earth in 1960-65 by Pound, Rebka, and Snider." http://www.einstein-online.info/spotlights/redshift_white_dwarfs.html

Banesh Hoffmann (p. 139): "The gravitational red shift does not arise from changes in the intrinsic rates of clocks. It arises from what befalls light signals as they traverse space and time in the presence of gravitation." http://www.amazon.com/
Relativity-Its-Roots-Banesh-Hoffmann/dp/0486406768

James Hartle, Gravity: An Introduction to Einstein's General Relativity, p. 113: "If we accept the equivalence principle, we must also accept that light falls in a gravitational field with the same acceleration as material bodies." https://www.amazon.com/
Gravity-Introduction-Einsteins-General-Relativity/dp/0805386629

Paul A. Tipler, Ralph A. Llewellyn, Modern Physics: "But according to the equivalence principle, there is no way to distinguish between an accelerating compartment and one with uniform velocity in a uniform gravitational field. We conclude, therefore,
that A BEAM OF LIGHT WILL ACCELERATE IN A GRAVITATIONAL FIELD AS DO OBJECTS WITH REST MASS. For example, near the surface of Earth light will fall with acceleration 9.8 m/s^2." http://web.pdx.edu/~pmoeck/books/Tipler_Llewellyn.pdf

University of Illinois at Urbana-Champaign: "Consider a falling object. Its speed increases as it is falling. Hence, if we were to associate a frequency with that object the frequency should increase accordingly as it falls to earth. Because of the
equivalence between gravitational and inertial mass, we should observe the same effect for light. So lets shine a light beam from the top of a very tall building. If we can measure the frequency shift as the light beam descends the building, we should be
able to discern how gravity affects a falling light beam. This was done by Pound and Rebka in 1960. They shone a light from the top of the Jefferson tower at Harvard and measured the frequency shift. The frequency shift was tiny but in agreement with the
theoretical prediction." https://courses.physics.illinois.edu/phys419/sp2011/lectures/Lecture13/L13r.html

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