Earth's
Rotation Day is celebrated on January 8 every
year to mark the anniversary of the demonstration by French physicist Léon
Foucault of the Earth's rotation on its axis.
In 1851, Foucault accomplished this through an
experiment using a pendulum, famously known as the Foucault Pendulum. It
provided visual proof of Earth's rotation. The pendulum's plane of oscillation
rotates over time, a phenomenon that can only be explained by the Earth
rotating beneath it. Foucault's pendulum became a symbol, which is displayed in
museums worldwide. January 8 was chosen to mark the day Foucault proved that
the Earth rotates on its axis.
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