Why June 30 Will Be 1 Second Longer

Monday, June 29, 2015 - 07:00 in Astronomy & Space

This year has a leap second, set to take place on Tuesday (June 30) at 7:59:60 p.m. EDT. The reason? 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.

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