Related articles:
Metre
Hertz
Hour
Day
SI base unit
Becquerel
Leap second
International System of Units
Atomic clock
Ampere
Minute
Sexagesimal
Time
Gravitational time dilation
Star
Magnetic field
Key terms:
second
clock
atomic
units
hour
optical
cesium
atomic clock
trap
mean
defined
definition
measured
system of units
motion
frequency
vacuum
transition
astronomical
units of time
segundo
pendulum
relative
multiples
standards
free space
subdivided
mechanical
cesium atom
julian year
sexagesimal
atomic time
definition of the second
international system of units
national physical laboratory
s tables
tropical year
leap second
calendar
trapped ion
ground state
absolute zero
microwave
epoch
iau
base unit
astronomy
ephemeris time
lasting
nist
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