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This topic has appeared in the trending rankings 1 time(s) in the past year. While it does not trend frequently, its appearance suggests a renewed or concentrated surge of public interest.
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Foucault's_measurements_of_the_speed_of_light entered the ranking for the first time today at position #. This is its highest position ever recorded.
This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-04-12 and was most recently seen on 2026-04-12.
In 1850, Léon Foucault used a rotating mirror to perform a differential measurement of the speed of light in water versus its speed in air. Together with a similar measurement by Hippolyte Fizeau, this result confirmed the wave behavior of light. In 1862, Foucault used a similar apparatus to measure the speed of light in the air, obtaining a value within 0.6% of the modern value. Albert A. Michelson extended that technique in a series of experiments from 1877 to 1930, approaching the modern value to within 0.05%.
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