Horologists around the world on Saturday will carry out one of the weirdest operations of their profession: they will hold back time.
The last minute of June 30, 2012 is destined to be 61 seconds long, for timekeepers are to add a "leap second" to compensate for the wibbly-wobbly movements of our world.
The ever-so-brief halting of the second hand will compensate for a creeping divergence from solar time, meaning the period required for Earth to complete a day.
The planet takes just over 86,400 seconds for a 360-degree revolution.
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