Related articles:
Atomic clock
MKS system of units
Clock
Clock face
Louis Essen
Hertz
International System of Units
Centimetre gram second system of units
SI base unit
Metre-tonne-second system of units
Becquerel
Minute
Time standard
Caesium
Leap second
Hour
Seconds pendulum
Coordinated Universal Time
Julian year (astronomy)
Ephemeris time
Sexagesimal
Day
Time
Magnetic field
Key terms:
second
atomic
clock
units
atomic clock
measured
definition
si
hour
minutes
system of units
optical
caesium
defined
mean
motion
julian
zero
frequency
segundo
trap
astronomical
international system of units
ephemeris
radiation
periods
transition
pendulum
units of time
si second
julian year
absolute zero
leap
subdivided
atomic time
sexagesimal
national physical laboratory
tropical year
multiplied
displayed
trapped ion
tables
ground state
epoch
microwave
multiples
iau
leap second
hyperfine
lasting
base unit
observations
astronomy
uncertainty
ephemeris time
motion of the sun
weights and measures
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