"However, it was two years after special relativity, in 1907, that Einstein had what he'd later refer to as his happiest thought: the equivalence principle." https://bigthink.com/starts-with-a-bang/einstein-shift/

The irony is that the equivalence principle DISPROVES general relativity. According to this principle, as light falls towards a source of gravity, its speed INCREASES as per Newton:

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

James Hartle, "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

"To see WHY A DEFLECTION OF LIGHT WOULD BE EXPECTED, consider Figure 2-17, which shows a beam of light entering an accelerating compartment. Successive positions of the compartment are shown at equal time intervals. Because the compartment is accelerating, the distance it moves in each time interval increases with time. The path of the beam of light, as observed from inside the compartment, is therefore a parabola. 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

Einstein's general relativity predicts that, as light falls towards a source of gravity, its speed DECREASES:

"Contrary to intuition, the speed of light (properly defined) decreases as the black hole is approached...If the photon, the 'particle' of light, is thought of as behaving like a massive object, it would indeed be accelerated to higher speeds as it falls toward a black hole. However, the photon has no mass and so behaves in a manner that is not intuitively obvious." http://www.physlink.com/Education/AskExperts/ae13.cfm

"Simply put: Light appears to travel slower near bigger mass (in stronger gravitational fields)." https://speed-of-light.com/speed_of_light_gravity.html

"Thus, as φ becomes increasingly negative (i.e., as the magnitude of the potential increases), the radial "speed of light" c_r defined in terms of the Schwarzschild parameters t and r is reduced to less than the nominal value of c." https://www.mathpages.com/rr/s6-01/6-01.htm

"The change in speed of light with change in height is dc/dh=g/c." https://www.youtube.com/watch?v=FJ2SVPahBzg

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Pentcho Valev wrote:

> "However, it was two years after special relativity, in 1907, that
> Einstein had what he'd later refer to as his happiest thought: the
> equivalence principle."
> https://bigthink.com/starts-with-a-bang/einstein-shift/

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China warns USA
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Einsteinians teach that the gravitational redshift measured in the Pound-Rebka experiment gloriously proved gravitational time dilation, a miracle (more precisely, idiocy) predicted by Einstein's general relativity:

Professor Jim Al-Khalili, Commander of the Order of the British Empire, Fellow of the Royal Society: "There is another way of slowing time down that does not require high speed travel. Instead, Einstein’s General Theory of Relativity (1915) shows that a gravitational field will do the same job. The effect can even be seen due to the Earth’s gravity but, due to the relatively small mass of our planet, the effect is tiny. Nevertheless, it was measured by two Americans, Pound and Rebka, in 1958 in one of the most precise and beautiful experiments in the whole of physics. Thus clocks run faster out in space than they do on the surface of the Earth. To travel into the future, all you need to do is find a suitable massive object, such as a black hole or neutron star, which has a strong enough gravitational field to significantly warp spacetime in its vicinity, and orbit around it a few times. While doing this your time will flow more slowly than it does in the relatively weaker gravitational field on the surface of the Earth.." http://personal.ph.surrey.ac.uk/~phs1ja/1STR/time.pdf

David Morin: "The equivalence principle has a striking consequence concerning the behavior of clocks in a gravitational field. It implies that higher clocks run faster than lower clocks. If you put a watch on top of a tower, and then stand on the ground, you will see the watch on the tower tick faster than an identical watch on your wrist. When you take the watch down and compare it to the one on your wrist, it will show more time elapsed. [...] This GR time-dilation effect was first measured at Harvard by Pound and Rebka in 1960. They sent gamma rays up a 20m tower and measured the redshift (that is, the decrease in frequency) at the top. This was a notable feat indeed, considering that they were able to measure a frequency shift of gh/c^2 (which is only a few parts in 10^15) to within 1% accuracy." http://www.personal.kent.edu/~fwilliam/Chapter%2013%20General%20Relativity.pdf

"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

Sometimes Einsteinians test if the more-than-a century brainwashing has completely paralysed the scientific community. Here they inform the community that the gravitational redshift measured in the Pound-Rebka experiment is a direct consequence of Newton's variable speed of light, not of gravitational time dilation:

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

The scientific community does not react and Einsteinians conclude that, yes, the paralysis is complete. So complete that when Pound and Snider themselves explain that their experiment confirmed Newton's variable speed of light and did not confirm gravitational time dilation, the community remains blocked by crimestop:

R. V. Pound and J. L. Snider, Effect of Gravity on Gamma Radiation: "It is not our purpose here to enter into the many-sided discussion of the relationship between the effect under study and general relativity or energy conservation. It is to be noted that no strictly relativistic concepts are involved and the description of the effect as an "apparent weight" of photons is suggestive. The velocity difference predicted is identical to that which a material object would acquire in free fall for a time equal to the time of flight...The view that the local time scale depends on the gravitational potential appears to require a coherent source for confirmation. The present experiment is unable to distinguish between frequency changes and velocity changes, for example. It appears as if an experimental comparison of clocks at different potentials would make a useful complementary contribution to the over-all status of confirmation of theory." http://virgo.lal.in2p3.fr/NPAC/relativite_fichiers/pound.pdf

George Orwell: "Crimestop means the faculty of stopping short, as though by instinct, at the threshold of any dangerous thought. It includes the power of not grasping analogies, of failing to perceive logical errors, of misunderstanding the simplest arguments if they are inimical to Ingsoc, and of being bored or repelled by any train of thought which is capable of leading in a heretical direction. Crimestop, in short, means protective stupidity."

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