New Year's Eve countdown to take second longer than normal

Horologists to compensate for slowdown in Earth's rotation by introducing 'leap second' after 23.59:59 on 31 December

Counting down to 2017 will take longer than usual this New Year's Eve as horologists compensate for a slowdown in the Earth's rotation.

To be precise, it will last an extra second. The National Physical Laboratory (NPL) is to introduce a "leap second" after 23.59:59 on 31 December.