Sagnac Experiment

The Sagnac Experiment was first conducted by French physicist Georges Sagnac in 1913. The experiment is essentially the same experiment as the Michelson-Morley Experiment, except that it is on a horizontal rotating turn-table. The results of the Sagnac Experiment show that when the table is rotated around on a horizontal axis during the experiment, the velocity of light indeed changes. This contradicts the Michelson-Morley Experiment that was designed to use the supposed movement of the earth to change position, and which showed no change in light velocity.

From a paper on the Sagnac Effect we read:

A Critical Analysis
In Theory of Relativity: A Critical Analysis (Archive) its author Dr. Roberto Monti (bio) describes in the abstract:

On the subject of the Sagnac Effect, Dr. Monti states:

Malcom Bowden
The geocentrist Malcom Bowden describes the Sagnac Experiment in the following video:

Video Description:

The video author's personal views on geocentricity aside, Mr. Bowden provides an accurate description of the Sagnac Experiment and its results.

University of Geneva
The Sagnac effect and transformations of relative velocities between inertial frames J.H.Field Département de Physique Nucléaire et Corpusculaire, Université de Genève Full Text Link (Archive)

From the Abstract:

From the Conclusion:

General Relativity Framework
On the assertion that the Sagnac Effect is explained under the framework of General Relativity theory, Professor Ramzi Suleiman of the University of Haifa writes the following:

The Sagnac Effect Falsifies Special Relativity Theory (Archive)

Wang Experiment
It has been claimed that Special Relativity does not apply to the Sagnac Effect because it involves rotational acceleration. In 2004, Dr. Ruyong Wang demonstrated that a non-accelerating observer can also measure a difference in lightspeed, falsifying Special Relativity's explanation of the Michelson-Morley Experiment.


 * 2004 Wang. Generalized Sagnac Effect (pdf)
 * First experiment conducted by R. Wang
 * Second experiment carried out by R. Wang

Robert Bennett
Robert Bennett, Ph.D. writes:

See: A Landmark Experiment: The Linear Sagnac Test of Ruyong Wang

Al Kelly
From Challenging Modern Physics: Questioning Einstein's Relativity Theories by Al Kelly (bio) we find:

José Croca
In the book Unified Field Mechanics II we find a paper by Physicist José R. Croca, Ph.D. (bio), where we see:

In parting, Dr. Croca states:

Defeated, and with the ever need to have an 'explanation' to keep the model alive, relativists seem to hint that relativity might operate differently at different scales. Dr. Croca suggests that Special Relativity is useful for explaining why light is consistent in experiments of the Earth going around the Sun (Michelson-Morley Experiment) and with the direction of Starlight (Airy's Failure), but that this theory is not applicable in other experiments such as Sagnac and Wang devices which have observed an inconsistency of light speed for different observing points, including light traveling faster than c—which is directly contradictory to Special Relativity's postulate of a speed consistency of light to all observers and the luminal speed limit of c.

One must remark that it is quite odd and remarkable that Special Relativity remains true despite a direct violation of its postulates with multiple experiments; apparently only applicable to certain situations involving the motion of the Earth as a heliocentric explanation for why the Earth has been tested to be horizontally motionless.

Daniel Y. Gezari
Dr. Gezari (bio) in his Experimental Basis for Special Relativity in the Photon Sector shows us that Special Relativity is a theory of limited experimental validity and casts doubt on the invariance of c postulate used to justify the Michelson-Morley and Airy's Failure experiments.

A reference is made in the paper to the Michelson-Gale Experiment. See the Michelson-Gale-Pearson Experiment

Quotes
-- Howard C. Hayden and Cynthia K Whitney, "If Sagnac and Michelson-Gale Why Not Michelson-Morley?" Galilean Electrodynamics, vol. 1, no. 6, Tufts University, Nov./Dec. 1990, pp. 73-74.