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