If you are waiting for 2016 to end you’ll
have to wait a second longer because international time experts are delaying
the onset of 2017. The extra second added to 2016 is to compensate for a
slowdown in the Earth’s rotation.
So as you count down to midnight on 31
December, count down from 11. Peter Whibberley, a senior research scientist at
the National Physical Laboratory in Teddington, England, said: "Leap
seconds are needed to prevent civil time drifting away from Earth time. Although
the drift is small - taking around 1,000 years to accumulate a one-hour time
difference - if not corrected it would eventually result in clocks showing
midday before sunrise."
The International Earth Rotation and
Reference Systems Service in Paris decides when leap seconds are needed, and
they are always announced about six months in advance. That is because the
extra second can be a nightmare for communication networks, financial systems,
and other applications that rely on precise timing, so they need to be
programmed into computers to prevent mistakes.
This is the 27th time a leap second has
been introduced since 1972. The extra second is normally added every two or
three years. The last leap second was inserted just 18 months ago.
It's also possible for seconds to be
removed, but this has never happened.
The leap
second is almost always introduced in the final minute of June or December, but
they can be implemented in March or September on rare occasions.
So 2016 can’t
end a second too soon!
MARTINA NICOLLS is an international
aid and development consultant, and the author of:- The Shortness of
Life: A Mongolian Lament (2015), Liberia’s Deadest Ends (2012), Bardot’s Comet
(2011), Kashmir on a Knife-Edge (2010) and The Sudan Curse (2009).
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