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The pendulum consists of a heavy weight suspended from a long, thin wire. The pendulum is initially set swinging in a vertical plane. As the pendulum swings, the Earth rotates beneath it. This causes the plane of the pendulum's swing to appear to rotate slowly, completing one full rotation in about 24 hours.
As the pendulum swings back and forth, it maintains its plane of oscillation, which is fixed in space. However, the Earth rotates underneath it, causing the observer on the Earth to perceive the plane of oscillation as rotating. This rotation occurs because different parts of the Earth's surface are moving at different speeds due to the Earth's rotation.