WASHINGTON: To maintain accuracy, NASA said its missions, including the Solar Dynamics Observatory, or SDO, which continuously watches the sun, will join official clocks around the world in adding a leap second to the final minute of 2016.
On December 31, 2016, official clocks around the world will add a leap second at 23 hours, 59 minutes and 59 seconds Coordinated Universal Time (UTC).
Clocks do this to keep in sync with Earth's rotation, which gradually slows down over time. When the dinosaurs roamed Earth, for example, our globe took only 23 hours to make a complete rotation.
In space, millisecond accuracy is crucial to understanding how satellites orbit.
"SDO moves about 1.9 miles every second," Dean Pesnell, project scientist for SDO at NASA's Goddard Space Flight Center in Greenbelt, Maryland, said in a statement.
"So does every other object in orbit near SDO. We all have to use the same time to make sure our collision avoidance programs are accurate. So we all add a leap second to the end of 2016, delaying 2017 by one second," Pesnell noted.
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