'Leap second' 1 July to keep in step with slowing globe

The ever-so-slight slowing of Earth's rotation means a leap second must be added to our clocks every few years to keep atomic clocks in sync with Earth, shown here in an image taken by the Apollo 8 astronauts in December 1968.
Leap second was added to the International Atomic Time clocks to help the Earth catch up from slowing down. Earth has started to slightly slow down at a non-uniform rate, possibly from the molten core, the rolling of the oceans, the melting of polar ice and the effects of solar and lunar gravity.
the world's official timekeepers will add a leap second for the first time in 3½ years..................
Read Full Article here