The Leap Second Has Been Canceled

The Leap Second Has Been Canceled: Earth rotates at about 1,000 miles per hour, on average. But sometimes gravitational interactions with other celestial bodies or the movement of air, water and rock on our dynamic planet can affect its rotation speed.CreditCredit...Miguel Román, Joshua Stevens/NASA's Goddard Space Flight Center By K. R. Callaway Every few years since 1972, computers, financial institutions, communications