November 1, 1932

[jody2.718]

The Kennedy–Thorndike experiment is published,
showing that measured time as well as length is affected by motion,
in accordance with the theory of special relativity.
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https://www.nuclear-power.com/kennedy-thorndike-experiment/

The Kennedy-Thorndike experiment demonstrated that the speed of light remained constant,
regardless of the motion of the interferometer or the orientation of its arms. This outcome
provided strong support for the time dilation aspect of the Special Theory of Relativity,
as it confirmed that the speed of light was invariant. Furthermore, the results of the experiment contradicted the predictions of the classical ether theory, bolstering the case against the existence of the luminiferous ether.

The success of the Kennedy-Thorndike experiment not only played a crucial role in validating
Einstein’s theory, but also had profound implications for our understanding of space and time.
The experiment showed that the classical notion of absolute time, as proposed by Isaac Newton, was incorrect. Instead, the passage of time is relative and depends on the observer’s motion.

This realization transformed our understanding of the physical world and set the stage for
further developments in modern physics, including the General Theory of Relativity and the field of relativistic cosmology.