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Devil
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June 30th Gets an Extra Leap Second since Earth's Rotation is Slowing Down.
So What is a LEAP Second:
Its is a one-second adjustment that is occasionally applied to UTC time (i.e Coordinated Universal Time) in order to keep its time of day close to the mean solar time.
What is Causing LEAP Second :
Slowing of Earth rotation, so these has to adjusted and we Adjust by adding an extra second to that day in every 3 years.
Learn more what NASA Says about it : http://www.nasa.gov/topics/solarsystem/features/extra-second.html
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