#OnThisDay 1851: Leon Foucault demonstrated the rotation of the Earth using a pendulum: https://t.co/hyxiTXP5zf http://pic.twitter.com/thgvkub7rL
— David Dickinson (@Astroguyz) January 6, 2016
via Twitter https://twitter.com/Astroguyz
January 06, 2016 at 05:21PM
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