January 10 , 2026
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- Earth’s Rotation Day is observed on January 8, 2026, marking 175 years of Léon Foucault’s pendulum demonstration (1851).
- The day remembers Léon Foucault, a French physicist, who experimentally proved that the Earth rotates on its axis.
- He used Foucault’s Pendulum, a long-suspended lead ball, to show Earth’s rotation through its changing swing direction.
- The Earth completes one full rotation in about 24 hours, which creates day and night.
- This discovery helped improve scientific understanding of astronomy, weather patterns, and ocean currents.
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