Akram Louiz, 2022: "Furthermore, in the Doppler effect, the real constant is the wavelength since the source of the light doesn't change the manner of light production, whereas the real variables are the frequency and the speed of light...Indeed, the frequency changes, but it is the light speed C that changes proportionally, and not the wavelength. At the end, the equation : C = (frequency × wavelength) stays always correct." https://www.researchgate.net/publication/369143082_Physics_letter_Cosmical_observations_and_experiments_against_the_relativistic_explanations_of_the_Doppler_effect_and_the_Gravitational_effect_of_the_light

Ten years ago:

FQXi essay contest, 2012 − Questioning the Foundations: Which of our basic physical assumptions are wrong?
Pentcho Valev, Shift in Frequency Implies Shift in Speed of Light
https://fqxi.org/data/essay-contest-files/Valev_Shift_in_Frequency_Im.pdf

Half a century ago:

Bryan G. Wallace, Radar Testing of the Relative Velocity of Light in Space, Spectroscopy Letters, 1969, pp. 361-367. ABSTRACT: "Published interplanetary radar data presents evidence that the relative velocity of light in space is c+v and not c." INTRODUCTION: "There are three main theories about the relativity velocity of light in space. The Newtonian corpuscular theory is relativistic in the Galilean sense and postulates that the velocity is c+v relative to the observer. The ether theory postulates that the velocity is c relative to the ether. The Einstein theory postulates that the velocity is c relative to the observer. The Michelson-Morley experiment presents evidence against the ether theory and for the c+v theory. The c theory explains the results of this experiment by postulating ad hoc properties of space and time..." http://sciliterature.50webs.com/SpecLetters1969-p361-367.pdf

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Pentcho Valev

Sometimes it appears that the truth resurfaces in the establishment as well, but this is just hype (post-truth scientists cannot make money and career without hype):

"Was Einstein wrong? The idea of a variable speed of light, championed by an angry young scientist, could one day topple Einstein's theory of relativity...The speed of light might not be constant at all. Shock, horror! Does this mean the next Great Revolution in Science is just around the corner?" http://www.prospectmagazine.co.uk/magazine/waseinsteinwrong/

"Was Einstein wrong? Do we have to kill off the theory of space and time to make sense of the universe?" https://space.com/end-of-einstein-space-time

"Lee [Smolin] and I discussed these paradoxes at great length for many months, starting in January 2001. We would meet in cafés in South Kensington or Holland Park to mull over the problem. THE ROOT OF ALL THE EVIL WAS CLEARLY SPECIAL RELATIVITY. All these paradoxes resulted from well known effects such as length contraction, time dilation, or E=mc^2, all basic predictions of special relativity." Joao Magueijo, Faster Than the Speed of Light, p. 250 http://www.amazon.com/Faster-Than-Speed-Light-Speculation/dp/0738205257

"You want to go back to a notion of space-time that preceded the 20th century, and it wants to ignore the essential lessons about space-time that the 20th century has taught us." Joao Magueijo: "Yes, that's right. So it's nouveau-Newtonian." https://pirsa.org/16060116?t=3211

"...Dr. Magueijo said. "We need to drop a postulate, perhaps the constancy of the speed of light." http://www.nytimes.com/2002/12/31/science/e-and-mc2-equality-it-seems-is-relative.html

Joao Magueijo, Niayesh Afshordi, Stephon Alexander: "So we have broken fundamentally this Lorentz invariance which equates space and time...It is the other postulate of relativity, that of constancy of c, that has to give way.." https://youtu.be/kbHBBtsrU1g?t=1431

"Einstein introduced a new notion of time, more radical than even he at first realized. In fact, the view of time that Einstein adopted was first articulated by his onetime math teacher in a famous lecture delivered one century ago. That lecture, by the German mathematician Hermann Minkowski, established a new arena for the presentation of physics, a new vision of the nature of reality redefining the mathematics of existence. The lecture was titled Space and Time, and it introduced to the world the marriage of the two, now known as spacetime. It was a good marriage, but lately physicists passion for spacetime has begun to diminish. And some are starting to whisper about possible grounds for divorce." https://www.sciencenews.org/article/its-likely-times-are-changing

"Was Einstein wrong? At least in his understanding of time, [Lee] Smolin argues, the great theorist of relativity was dead wrong. What is worse, by firmly enshrining his error in scientific orthodoxy, Einstein trapped his successors in insoluble dilemmas." https://www.amazon.com/Time-Reborn-Crisis-Physics-Universe-ebook/dp/B009JWCQMK

Nima Arkani-Hamed: "Almost all of us believe that spacetime doesn't really exist, spacetime is doomed and has to be replaced..." https://youtu.be/U47kyV4TMnE?t=369

Philip Ball: "And by making the clock's tick relative - what happens simultaneously for one observer might seem sequential to another - Einstein's theory of special relativity not only destroyed any notion of absolute time but made time equivalent to a dimension in space: the future is already out there waiting for us; we just can't see it until we get there. This view is a logical and metaphysical dead end, says [Lee] Smolin." http://www.guardian.co.uk/books/2013/jun/10/time-reborn-farewell-reality-review

"Bye bye space-time: is it time to free physics from Einstein's legacy?" https://www.newscientist.com/article/mg24332472-900-bye-bye-space-time-is-it-time-to-free-physics-from-einsteins-legacy/

"Rethinking Einstein: The end of space-time...Horava, who is at the University of California, Berkeley, wants to rip this fabric apart and set time and space free from one another..." https://www.newscientist.com/article/mg20727721-200-rethinking-einstein-the-end-of-space-time/

What scientific idea is ready for retirement? Steve Giddings: "Spacetime. Physics has always been regarded as playing out on an underlying stage of space and time. Special relativity joined these into spacetime...The apparent need to retire classical spacetime as a fundamental concept is profound..." https://www.edge.org/response-detail/25477

"...says John Norton, a philosopher based at the University of Pittsburgh, Pennsylvania. Norton is hesitant to express it, but his instinct - and the consensus in physics - seems to be that space and time exist on their own. The trouble with this idea, though, is that it doesn't sit well with relativity, which describes space-time as a malleable fabric whose geometry can be changed by the gravity of stars, planets and matter." https://www.newscientist.com/article/mg20026831.500-what-makes-the-universe-tick

Nobel Laureate David Gross observed, "Everyone in string theory is convinced...that spacetime is doomed. But we don't know what it's replaced by." https://www.edge.org/response-detail/26563

Here is the crucial confession that explains everything:

"The whole of physics is predicated on the constancy of the speed of light," Joao Magueijo, a cosmologist at Imperial College London and pioneer of the theory of variable light speed, told Motherboard. "So we had to find ways to change the speed of light without wrecking the whole thing too much." https://motherboard.vice.com/en_us/article/8q87gk/light-speed-slowed

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Pentcho Valev

"Since the zero result of the M-M [Michelson-Morley] experiment can be explained by the Galilean velocity transformation, the Lorentz coordinate transformation formula becomes unnecessary. It means that the most important experimental basis for special relativity does not exist. Einstein's special relativity is just a historical misunderstanding." https://ccsenet.org/journal/index.php/apr/article/view/0/48536

Oh là là ! Western physics is irreversibly post-truth, so the truth resurfaces elsewhere.

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Pentcho Valev