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10,000
100
1,000
10
1
0.1
0.01
0.001
0.0001
1940
1950
1960
1970
1980
1990
2000
2010
10
-9
10
-10
10
-11
10
-12
10
-13
10
-14
10
-15
10
-16
10
-17
10
-18
Clock Uncertainty (ns/day)
Year
Frequency Uncertainty
Laser -
Cooled
Clocks
NBS-1
NBS-2
NBS-3
NBS-4
NBS-5
NBS-6
NIST-7
NIST-F1
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