As RIA "Novosti" reports, the extra second will be added due to the uneven rotation of the Earth, which is influenced by both lunar gravity and a number of other factors, such as atmospheric and intra-Earth processes. "In a normal situation, the last second of the outgoing year 2005 should have been the moment of 23 hours 59 minutes 59 seconds on December 31, and the first second of the new year 00 hours 00 minutes 00 seconds on January 1, 2006. The extra second will be added as follows: after the clocks show 23:59:59 on December 31, they will switch to 23:59:60 and only then will all zeros 'pop up'," the institute said.
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