"In his presentations of the complete version of General Relativity in late 1915 and the overview paper in 1916, Einstein presented his calculations of the three experimental tests. These were the rate of precession of the perihelion of the planet
Mercury, light bending close to the Sun and the gravitational redshift. He showed the Mercury orbit correction was in excellent agreement with observation, solving a long-standing problem. He repeatedly emphasized that there was no freedom in his theory
to adjust the predictions (no free parameters)..." https://royalsocietypublishing.org/doi/10.1098/rsnr.2020.0040

Einstein's no-adjustment lie is repeated here:

"Einstein was able to predict, WITHOUT ANY ADJUSTMENTS WHATSOEVER, that the orbit of Mercury should precess by an extra 43 seconds of arc per century should the General Theory of Relativity be correct." http://aether.lbl.gov/www/classes/p10/gr/
PrecessionperihelionMercury.htm

Sometimes the truth resurfaces even in post-truth science. Here Michel Janssen describes countless ad hoc adjustments made again and again until "excellent agreement with observation" was reached:

"But - as we know from a letter to his friend Conrad Habicht of December 24, 1907 - one of the goals that Einstein set himself early on, was to use his new theory of gravity, whatever it might turn out to be, to explain the discrepancy between the
observed motion of the perihelion of the planet Mercury and the motion predicted on the basis of Newtonian gravitational theory. [...] The Einstein-Grossmann theory - also known as the "Entwurf" ("outline") theory after the title of Einstein and
Grossmann's paper - is, in fact, already very close to the version of general relativity published in November 1915 and constitutes an enormous advance over Einstein's first attempt at a generalized theory of relativity and theory of gravitation
published in 1912. The crucial breakthrough had been that Einstein had recognized that the gravitational field - or, as we would now say, the inertio-gravitational field - should not be described by a variable speed of light as he had attempted in 1912,
but by the so-called metric tensor field. The metric tensor is a mathematical object of 16 components, 10 of which independent, that characterizes the geometry of space and time. In this way, gravity is no longer a force in space and time, but part of
the fabric of space and time itself: gravity is part of the inertio-gravitational field. Einstein had turned to Grossmann for help with the difficult and unfamiliar mathematics needed to formulate a theory along these lines. [...] Einstein did not give
up the Einstein-Grossmann theory once he had established that it could not fully explain the Mercury anomaly. He continued to work on the theory and never even mentioned the disappointing result of his work with Besso in print. So Einstein did not do
what the influential philosopher Sir Karl Popper claimed all good scientists do: once they have found an empirical refutation of their theory, they abandon that theory and go back to the drawing board. [...] On November 4, 1915, he presented a paper to
the Berlin Academy officially retracting the Einstein-Grossmann equations and replacing them with new ones. On November 11, a short addendum to this paper followed, once again changing his field equations. A week later, on November 18, Einstein presented
the paper containing his celebrated explanation of the perihelion motion of Mercury on the basis of this new theory. Another week later he changed the field equations once more. These are the equations still used today. This last change did not affect
the result for the perihelion of Mercury. Besso is not acknowledged in Einstein's paper on the perihelion problem. Apparently, Besso's help with this technical problem had not been as valuable to Einstein as his role as sounding board that had earned
Besso the famous acknowledgment in the special relativity paper of 1905. Still, an acknowledgment would have been appropriate. After all, what Einstein had done that week in November, was simply to redo the calculation he had done with Besso in June 1913,
using his new field equations instead of the Einstein-Grossmann equations. It is not hard to imagine Einstein's excitement when he inserted the numbers for Mercury into the new expression he found and the result was 43", in excellent agreement with
observation." Janssen, M. (2002) The Einstein-Besso Manuscript: A Glimpse Behind the Curtain of the Wizard. In The Collected Papers of Albert Einstein (Vols. 1-10, pp. 1987-2006). Princeton, NJ: Princeton University Press.

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Frederick Soddy, An Address to the fourth Conference of Nobel Prizewinners at Lindau (Bodensee), S. Germany, 30.VI.1954: "Incidentally the attempt to verify this during a recent solar eclipse, provided the world with the most disgusting spectacle perhaps
ever witnessed of the lengths to which a preconceived notion can bias what was supposed to be an impartial scientific inquiry. For Eddington, who was one of the party, and ought to have been excluded as an ardent supporter of the theory that was under
examination, in his description spoke of the feeling of dismay which ran through the expedition when it appeared at one time that Einstein might be wrong! Remembering that in this particular astronomical investigation, the corrections for the normal
errors of observation - due to diffraction, temperature changes, and the like - exceeded by many times the magnitude of the predicted deflection of the star's ray being looked for, one wonders exactly what this sort of "science" is really worth." http://
www.reformation.edu/scripture-science-stott/aarch/pages/10-soddy-to-nobel-prizewinners.htm

"Consider the case of astronomer Walter Adams. In 1925 he tested Einstein's theory of relativity by measuring the red shift of the binary companion of Sirius, brightest star in the sky. Einstein's theory predicted a red shift of six parts in a hundred
thousand; Adams found just such an effect. A triumph for relativity. However, in 1971, with updated estimates of the mass and radius of Sirius, it was found that the predicted red shift should have been much larger – 28 parts in a hundred thousand.
Later observations of the red shift did indeed measure this amount, showing that Adams' observations were flawed. He "saw" what he had expected to see." http://puritanreformed.blogspot.bg/2010/08/fallible-nature-of-supposed-objective.html

Jean-Marc Bonnet-Bidaud tells a breathtaking story. According to him, initially Einsteinians were all fraudsters but the fraudulent period ended in 1971 when Eddington's second (Sirius B) major hoax was exposed. Then, in the 1970's, all Einsteinians
became as honest as the day is long:

"The whole world believed for more than fifty years in an unverified theory. Because, we know it today, the first proofs...were not proofs. They were based in part on unmentionable manipulations aiming to obtain a result known in advance, and on
measurements tainted with uncertainties, when it was not a question of characterized fraud. It took until the 1970s for new methods to finally provide solid experimental proof of relativity." http://bonnetbidaud.free.fr/ce/relativite2008/pdf_CE/
RELATIVITE-052-456.pdf

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