Earth’s Rotation Day

Earth’s Rotation Day is celebrated every year on January 8th to honor French physicist Léon Foucault’s groundbreaking 1851 experiment that proved the Earth spins on its axis. Using his famous Foucault Pendulum, he provided visual, scientific evidence of Earth’s rotation — the very motion that causes day and night. The Earth rotates at tremendous speed, about 1,670 km/h (1,040 mph) at the equator, though this speed decreases toward the poles. Over millions of years, this rotation is slowly slowing down due to the Moon’s tidal pull, meaning our days are gradually becoming slightly longer. Earth’s Rotation Day reminds us of the fascinating science behind our planet’s movement and the wonders of physics that help us understand it.

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