Foucault pendulum

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The Foucault pendulum (pronounced /fuːˈkoʊ/ "foo-koh"), or Foucault's pendulum, named after

The Foucault pendulum (pronounced /fuːˈkoʊ/ "foo-koh"), or Foucault's pendulum, named after

the French physicist Léon Foucault, was conceived as an experiment to demonstrate the rotation of the Earth
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Foucault's Pendulum in the Panthéon, Paris

Foucault's Pendulum in the Panthéon, Paris

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A Foucault pendulum at the north pole. The pendulum swings in

A Foucault pendulum at the north pole. The pendulum swings in

the same plane as the Earth rotates beneath it.
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Animation of a Foucault pendulum at the Pantheon in Paris (48°52'

Animation of a Foucault pendulum at the Pantheon in Paris (48°52'

North), with the earth's rotation rate greatly exaggerated. The green trace shows the path of the pendulum bob over the ground (a rotating reference frame), while the blue trace shows the path in a frame of reference rotating with the plane of the pendulum.