Jan. 7, 1851: Foucault Gets the Swing of Things

Léon Foucault uses a pendulum to demonstrate the rotation of the Earth. It is the first direct visual evidence not based on watching the stars circle in the sky.

Source: http://www.wired.com/thisdayintech/2013/01/jan-7-1851-foucault-gets-the-swing-of-things/

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