30 Jun '15, 1pm

Why we have a leap second today

The year 2015 is not a leap year, but it does have a leap second , set to take place on today, June 30, at 7:59:60 p.m. EDT (23:59:60 GMT). "Earth's rotation is gradually slowing down a bit, so leap seconds are a way to account for that," Daniel MacMillan of NASA's Goddard Space Flight Center in Greenbelt, Maryland, said in a statement . Ask any person the length of a day, and she'll say 24 hours, which equates to 86,400 seconds. But the time it takes for Earth to rotate on its axis relative to the sun, called a mean solar day (or the average length of a day) is roughly 86,400.002 seconds long. This happens because Earth's rotation is slowing down, thanks to a kind of braking force caused by the gravitational tug of war between Earth, the sun and the moon, researchers at NASA said. Because of these planetary forces, a mean solar day likely hasn't lasted 86,400 seconds sinc...

Full article: http://www.mnn.com/green-tech/research-innovations/storie...

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At 07:59:59 today, you’ll get one extra second to your day @TODAYonline

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