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- Leap_second abstract "A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time. Without such a correction, time reckoned by Earth rotation drifts away from atomic time because of irregularities in the Earth's rate of rotation. Since this system of correction was implemented in 1972, 25 such leap seconds have been inserted. The most recent one happened on June 30, 2012 at 23:59:60 UTC.The UTC time standard, which is widely used for international timekeeping and as the reference for civil time in most countries, uses the international system (SI) definition of the second, based on atomic clocks. Like most time standards, UTC defines a grouping of seconds into minutes, hours, days, months, and years. However, the duration of one mean solar day is slightly longer than 24 hours (86400 SI seconds). Therefore, if the UTC day were defined as precisely 86400 SI seconds, the UTC time-of-day would slowly drift apart from that of solar-based standards, such as Greenwich Mean Time (GMT) and its successor UT1. The purpose of a leap second is to compensate for this drift, by occasionally scheduling some UTC days with 86401 or 86399 SI seconds.Specifically, a positive leap second is inserted between second 23:59:59 of a chosen UTC calendar date (the last day of a month, usually June 30 or December 31) and second 00:00:00 of the following date. This extra second is displayed on UTC clocks as 23:59:60. On clocks that display local time tied to UTC, the leap second may be inserted at the end of some other hour (or half-hour or quarter-hour), depending on the local time zone.A negative leap second would suppress second 23:59:59 of the last day of a chosen month, so that second 23:59:58 of that date would be followed immediately by second 00:00:00 of the following date. However, since the UTC standard was established, negative leap seconds have never been needed.Because the Earth's rotation speed varies in response to climatic and geological events, UTC leap seconds are irregularly spaced and unpredictable. Insertion of each UTC leap second is usually decided about six months in advance by the International Earth Rotation and Reference Systems Service (IERS), when needed to ensure that the difference between the UTC and UT1 readings will never exceed 0.9 second. Between their adoption in 1972 and June 2012, 25 leap seconds have been scheduled, all positive.".
- Leap_second thumbnail Leap_Second_-_June_30,_2012.png?width=300.
- Leap_second wikiPageExternalLink bulletinc.dat.
- Leap_second wikiPageExternalLink 1106.3141.
- Leap_second wikiPageExternalLink 1941487.1941505.
- Leap_second wikiPageExternalLink leapsecond.html.
- Leap_second wikiPageExternalLink bulletinc.dat.
- Leap_second wikiPageExternalLink leaps.htm.
- Leap_second wikiPageExternalLink time.gov.
- Leap_second wikiPageExternalLink leapsec.html.
- Leap_second wikiPageExternalLink 29a%20UTCLeapSecond.ppt.
- Leap_second wikiPageExternalLink leap.
- Leap_second wikiPageExternalLink metrologia-leapsecond.pdf.
- Leap_second wikiPageExternalLink 214time.htm.
- Leap_second wikiPageExternalLink bulletins.html.
- Leap_second wikiPageExternalLink gpsclock.htm.
- Leap_second wikiPageExternalLink leap-watch.htm.
- Leap_second wikiPageExternalLink leap-second.htm.
- Leap_second wikiPageExternalLink 479158a.html.
- Leap_second wikiPageExternalLink 29a%20UTCLeapSecond.ppt.
- Leap_second wikiPageExternalLink CGSIC_agenda_final.htm.
- Leap_second wikiPageExternalLink story.php?storyId=4734092.
- Leap_second wikiPageExternalLink bob8.asp.
- Leap_second wikiPageExternalLink leapsecs.
- Leap_second wikiPageID "18472".
- Leap_second wikiPageRevisionID "604430378".
- Leap_second hasPhotoCollection Leap_second.
- Leap_second subject Category:Timekeeping.
- Leap_second comment "A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time. Without such a correction, time reckoned by Earth rotation drifts away from atomic time because of irregularities in the Earth's rate of rotation. Since this system of correction was implemented in 1972, 25 such leap seconds have been inserted.".
- Leap_second label "Leap second".
- Leap_second label "Schaltsekunde".
- Leap_second label "Schrikkelseconde".
- Leap_second label "Seconde intercalaire".
- Leap_second label "Secondo intercalare".
- Leap_second label "Segundo bissexto".
- Leap_second label "Segundo intercalar".
- Leap_second label "Sekunda przestępna".
- Leap_second label "Секунда координации".
- Leap_second label "閏秒".
- Leap_second label "闰秒".
- Leap_second sameAs Přestupná_sekunda.
- Leap_second sameAs Schaltsekunde.
- Leap_second sameAs Segundo_intercalar.
- Leap_second sameAs Seconde_intercalaire.
- Leap_second sameAs Detik_kabisat.
- Leap_second sameAs Secondo_intercalare.
- Leap_second sameAs 閏秒.
- Leap_second sameAs 윤초.
- Leap_second sameAs Schrikkelseconde.
- Leap_second sameAs Sekunda_przestępna.
- Leap_second sameAs Segundo_bissexto.
- Leap_second sameAs m.04pb3.
- Leap_second sameAs Q194230.
- Leap_second sameAs Q194230.
- Leap_second wasDerivedFrom Leap_second?oldid=604430378.
- Leap_second depiction Leap_Second_-_June_30,_2012.png.
- Leap_second isPrimaryTopicOf Leap_second.
