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Space Timekeeping: Nasa's Sdo Adds Leap Second to Master Clock

Sun in extreme ultraviolet light

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.

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