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Earth’s Rotation Day 2026 Observed on January 8.

Important Days | Dated: 08 Jan 2026

Earth’s Rotation Day is observed annually on January 8 to commemorate the historic demonstration by French physicist Leon Foucault in 1851. Foucault proved that the Earth rotates on its axis using a simple pendulum, now known as the Foucault Pendulum. The day encourages scientific curiosity and understanding of planetary movements.

🎯 Key Highlights:

  • The original demonstration took place at the Pantheon in Paris.
  • Science centers worldwide organize pendulum demonstrations to educate students about the Coriolis effect.
  • Earth rotates at a speed of approximately 1,670 kilometers per hour at the equator.

💡 Other Important Facts:

  • Date: January 8.
  • Occasion: Earth's Rotation Day.
  • Scientist: Leon Foucault.

📚 Test Your Knowledge:

Which French physicist is credited with proving the Earth's rotation using a pendulum in 1851, commemorated on January 8?

Correct Answer: Leon Foucault

🚀 Quick Recap:

About Earth

  • Rotation Time – 23h 56m 4s
  • Direction – West to East