Related articles:
Metre
Ampere
Hour
Day
Minute
Hertz
SI base unit
Becquerel
Caesium
Leap second
Atomic clock
International System of Units
Tropical year
Centimetre gram second system of units
Sexagesimal
Orders of magnitude (time)
International Atomic Time
Julian year (astronomy)
Time
Gravitational time dilation
Kelvin
Star
Key terms:
second
clock
units
atomic
hour
measured
mean
optical
trap
defined
motion
minutes
atomic clock
caesium
definition
iau
segundo
vacuum
frequency
system of units
epoch
transition
pendulum
tables
astronomical
rotation
multiples
lasting
free space
subdivided
units of time
sexagesimal
julian year
atomic time
si second
astronomy
microwave
hyperfine
base unit
ground state
leap second
trapped ion
mechanical clock
observations
tropical year
absolute zero
ephemeris time
definition of the second
international system of units
national physical laboratory
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