Centuries: 10th century - 11th century - 12th century
Decades: 950s 960s 970s 980s 990s - 1000s - 1010s 1020s 1030s 1040s 1050s
Years: 998 999 1000 1001 1002 - 1003 - 1004 1005 1006 1007 1008
... and the insertion and removal of leap seconds at the very end of June and December.
The first atomic clock was built in 1949 at the U.S. National Bureau of ...
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