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By NASA
January 3, 2017
![[article image]](https://cacm.acm.org/system/assets/0002/6058/1317.nasa.sun_in_extreme_ultraviolet.large.jpg?1483461654&1483461653 "Sun in extreme ultraviolet light")
On Dec. 31, 2016, official clocks around the world will add a leap second just before midnight Coordinated Universal Time—which corresponds to 6:59:59 p.m. EST. NASA missions will also have to make the switch, including the Solar Dynamics Observatory, or SDO, which watches the sun 24/7.
From NASA
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