A leap second is a period of time lasting one second which is occasionally added onto either June 30 or December 31 of a given year to compensate for a change in the Earth's rotation. The time adjustment is often completed in years which the difference between atomic time and Earth time builds up enough to need correction. A leap second will be added to the final minute of December 31, 2008.
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Leap Second Background and Information
- LeapSecond.com: Leap Second Resources