On New Year's Eve, a "leap second" will be added to the world's clocks at 23 hours, 59 minutes and 59 seconds Coordinated Universal Time, the U.S. Naval Observatory announced.
For Minnesotans, that corresponds to 5:59:59 p.m. Central Standard Time on Wednesday, just in case you want to adjust your own clocks accordingly.
The extra second will be inserted at the observatory's Master Clock Facility in Washington, marking the 24th leap second since 1972 to be added to UTC, a uniform time scale kept by atomic clocks around the world.
The leap second is necessary because the Earth's rotation is gradually slowing down. Leap seconds have been added at intervals varying from six months to seven years, with the most recent being inserted on Dec. 31, 2005.
The observatory's mission includes determining the position and motion of the Earth, sun, moon, planets, stars and other celestial objects, providing astronomical data, determining precise time and measuring the Earth's rotation.
Paul Walsh, Star Tribune