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060104-F-3966R-005

Uploaded on Aug 18th, 2010
by pupuklangka
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060104-F-3966R-005
The U.S. Naval Observatory Alternate Master Clock, located on the 2nd Space Operations Squadron's operations center, is accurate to within one second every 20 million years. The clock showed 23:59:60 Saturday as 2nd SOPS and USNO professionals added the first leap second in seven years.

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