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Leap Second - What is it?
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& Leap SecondWhat's a Leap SecondEvery now and then a leap second is added to
in order to synchronize atomic clocks with the Earth's ever slowing rotation.Atomic clocks are slightly too accurate. Leap seconds are added to realign
with the Earth's rotation. (/kvkirillovAtomic Time vs. Universal TimeTwo components are used to determine Coordinated Universal Time (UTC):: A time scale that combines the output of some 200 highly precise atomic clocks worldwide, and provides the exact speed for our clocks to tick.Universal Time (UT1), also known as Astronomical Time, refers to the Earth's rotation around its own axis, which determines the . When the difference between UTC and UT1 approaches 0.9 seconds, a leap second is added to UTC and clocks worldwide. Upcoming leap seconds are announced by the International Earth Rotation and Reference System Service (IERS) in .The reason we have to add a second every now and then, is that Earth's rotation around its own axis, is gradually slowing down, although very slowly.Atomic clocks, however, are programmed to tick away at pretty much the same speed over millions of years. Compared to the Earth's rotation, the atomic clocks are simply too accurate.How Often Are Leap Seconds Added?Before the first leap second was added in 1972, UTC was 10 seconds behind Atomic Time. So far, a total of . This means that the Earth has slowed down an additional 26 seconds compared to atomic time since then.However, this does NOT mean that the days are 25 seconds longer nowadays. The only difference is that the days a leap second was added had 86,401 seconds instead of the usual 86,400 seconds.36 Seconds DifferenceThe previous leap second was added on June 30, 2015 at 23:59:60 UTC. The difference between
(UTC-TAI) is now 36 sec.Check our
for updates about leap seconds.In this ArticleAdvertising
Leap Seconds What's a Leap Second?
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What does AM and PM mean? Before noon, and after noon of course.
The UK is not on Greenwich Mean Time (GMT) all year. During Daylight Saving Time the correct time zone is British Summer Time (BST).

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