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Updated March 12, 2022
  Foucault Pendulum, Pantheon

Image: Foucault Pendulum, Pantheon, Paris, France.
The Pantheon is a neoclassical monument located in Paris, on the Sainte-Geneviève mountain. This is where the great figures who have marked the history of France are honored.

  Foucault pendulum with respect to a reference

Image : The pendulum is fixed relative to what?

Universe observable by Foucault's pendulum

Image: The cosmic microwave background is electromagnetic radiation located in the very homogeneous microwave range observed in all directions of the sky, throughout the Universe.
These slight temperature fluctuations would be the reflection of the first density variation at the origin of the clusters of galaxies. Credit: European Space Agency

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