The Earth rotates, and where you are changes how you see the universe. We are introduced to Foucault’s pendulum. Moving under the influence of gravity, over the course of a day the pendulum’s ...

PROF. GREENHILL gives currency to quite an erroneous idea, in last week's NATURE (p. 50). He says “in the Foucault experiment of the pendulum which shows the rotation of the earth, the slightest ...