Earth's rotation

Geography of Foucault Pendulums

Elizabeth Borneman

French philosopher Leon Foucault developed a pendulum to prove that the Earth rotates on its axis. The swing of the pendulum varies depending on its location on Earth.

Leap Second to be Added June 30, 2015

Caitlin Dempsey

On Tuesday June 30, 2015, the day will be a second longer than usual.  Similar to how February gains an ...