leap second

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leap second

See universal time.

leap second

References in periodicals archive ?
Therein lies the cosmic joke--the joke that has led to the little leap-second scene played out at New Year's (a scene that has occurred twenty-two times before), and the much bigger battle over whether that scene should ever take place again.
NIST also, like the USNO, harbors its share of leap-second foes.
This year was forecast to be a leap-second year, a strange occurrence which happens every two years on average, which would have meant that there would have been 61 seconds in the last minute of the 21st century.
By the time Big Ben's bongs and that extra leap-second were being broadcast, partygoers across the nation had whiled away large chunks of the last night of the year rummaging in bags and pockets for vibrating phones, peering at a flashing in-box and jabbing their digits on tiny keyboards to reply with exactly the same inane little message.
But the occasional leap-second jerks in UTC go unfelt, of course, by the Earth, planets, and stars.