Tonight, clocks around the world will click from 23:59:59 to 23:59:60 rather than immediately going to midnight on Wednesday. Happy Leap Second people!

The last day of the month – Tuesday, June 30 – will last one second longer than most every other June 30 in history.

"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.

The reason some days need be made to last 86,401 seconds instead of just 86,400 is because otherwise atomic clocks might become out of sync with Earth's rotation.

But for this extra second, the Coordinated Universal Time measured by atomic clocks could over the years become so out of sync with Earth's rotation that it would show noon instead of midday.

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