active·OtherFoucault's pendulum: how French physicist measured light speed and proved Earth's rotation18 Sept 2026·1 event·1 sourceFollowHow events unfoldedFrom the beginning to today18/09/2026, 08:30Foucault's pendulum: how French physicist measured light speed and proved Earth's rotation1 source →1 of 1 eventsStoryline coverage1 source · 1/7