Related terms:
nist
clocks
ace
trap
turing
atomic time
system of units
turing machine
microwave
atomic
clock
transition
accuracy
astronomical
national institute of standards
optical
institute of standards and technology
frequency
standards
machine
cambridge
definition
electronic
Wikipedia sources:
Second
Alan Turing
Von Neumann architecture
Indian Standard Time
Metrology
Atomic clock
Time dilation
Context for words:
national
physical
laboratory
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