Images from NASA's Solar Dynamics Observatory such as this one showing the sun as it appears in wavelengths of extreme ultraviolet lighthave a time stamp showing Universal Time on it. To maintain accuracy, SDO will join official clocks around the world i
Credit: NASA/SDO
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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