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Leap second - Wikipedia

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A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC), to accommodate the difference between precise time (International Atomic Time (TAI), as measured by atomic clocks) and imprecise observed solar time (UT1), which varies due to irregularities and long-term slowdown in the Earth's rotation. The UTC time standard, widely used for international timekeeping and as the reference for civil time in most countries, uses TAI and consequently would run ahead of observed solar time unless it is reset to UT1 as needed. The leap second facility exists to provide this adjustment. The leap second was introduced in 1972. Since then, 27 leap seconds have been added to UTC, with the most recent occurring on December 31, 2016.[1] Because the Earth's rotational speed varies in response to climatic and geological events,[2] UTC leap seconds are irregularly spaced and unpredictable. Insertion of each UTC leap second is usually decided about six months i

Leap second - Wikipedia Jump to content From Wikipedia, the free encyclopedia Intermittent adjustment to UTC Screenshot of the UTC clock from time.gov during the leap second on 31 December 2016 A leap second (sometimes called intercalary second ) [ 1 ] is a one- second adjustment occasionally applied to Coordinated Universal Time (UTC), to accommodate the difference between International Atomic Time (TAI), as measured precisely by atomic clocks , and observed solar time ( UT1 ), which varies due to irregularities and long-term slowdown in the Earth's rotation . The UTC time standard, widely us

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