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Why today is Earth Rotation Day

2026-01-08 17:35:02Lifestyle SHKRUAR NGA REDAKSIA VOX
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Today is Earth Rotation Day, declared as such in honor of French physicist Léon Foucault.

Earth Rotation Day coincides with Foucault's first public demonstration, in Paris. At the 1851 World's Fair, the physicist demonstrated how the Earth rotates by hanging a lead-filled bronze ball from the top of the Pantheon in Paris. This device, now known as the Foucault Pendulum, demonstrated that the plane of the pendulum's swing would rotate relative to the Earth's own rotation.

Foucault pendulums can now be found in science museums around the world and are an important tool for understanding and learning about solar science. While Isaac Newton discovered gravity, he did not actually explain the cause behind it, but simply that it exists as a force, and so this scientific knowledge was expanded through Foucault.

Almost everyone knows that the Earth rotates on its axis and one complete rotation takes 24 hours. But what some people may not know is that the speed of the Earth's rotation varies slightly from day to day and from year to year.

So a true solar day is not exactly 24 hours, but the differences are a matter of seconds. The basic concept of a solar day is the length of time it takes for the earth to complete one complete rotation on its axis.

 

 


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