🌍🕰️¹
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#universal time
#UT1
#time standard
#earth rotation
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#coordinated universal time
#gmt
#zulu time
#time standard
#zero offset
#world time
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#UTC
#coordinated universal time
#time standard
#global time
#zero meridian
#computing time
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#atomic clock
#caesium clock
#time standard
#physics
#metrology
#cs-133
#timekeeping
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#NIST
#time standard
#atomic clock
#official US time
#metrology
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#chronometer
#precision clock
#accurate clock
#high accuracy
#time standard
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#royal observatory
#greenwich
#gmt
#astronomical time
#time standard
#history of time
#meridian line
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#gmt
#UTC
#time zone
#zero offset
#time standard
#plus zero
#reference time
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#gmt
#greenwich mean time
#prime meridian
#zero longitude
#royal observatory
#time standard
#navigation time
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#prime meridian
#gmt
#reference point
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#longitude zero
#time standard
#location time
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#UTC
#coordinated universal time
#gmt
#time standard
#reference time
#world time
#zero offset
#time system
#universal time #UT1 #time standard #earth rotation