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