Foucault pendulum - Wikipedia - Swinging the earth
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The Foucault pendulum or Foucault's pendulum is a simple device named after French So, relative to Earth, the plane of oscillation of a pendulum at the North Pole – viewed from above To demonstrate rotation directly rather than indirectly via the swinging pendulum, Foucault used a gyroscope in an experiment. And that this somehow proved the Earth was rotating beneath your feet. You probably nodded and watched the weight swing for a while.