__1851: __ Léon Foucault uses a pendulum to demonstrate the rotation of the Earth. It is the first direct visual evidence not based on watching the stars circle in the sky. Jean Bernard Léon Foucault ...
The Foucault pendulum which was displayed for many years in the Smithsonian's National Museum of American History was removed in late 1998 to make room for the Star-Spangled Banner Preservation ...
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