Universal Time
World's shared clock
Universal Time is the modern term for mean solar time at the prime meridian in Greenwich, England—the basis for civil timekeeping worldwide.
It replaced Greenwich Mean Time as the standard reference, though the two are essentially identical for everyday purposes.
Abbreviated UTC (from the French), it serves as the anchor from which time zones are calculated: The server logs timestamps in UTC.
Universal time standard
- GMTGlobal time baseline
- synchronizationAligning timing across systems
- timekeepingMeasuring duration's passage
- NTPClock synchronization protocol
precision · radio broadcast · standardization · coordination
Pole-to-pole great circle
- prime meridianZero-degree longitude line
- observatoryFacility for celestial study
- Royal ObservatoryAstronomy institution at Greenwich
- ephemerisCelestial body position chart
celestial · equinox · solar day · star catalog · celestial navigation · almanac · solar noon
East-west angular distance
- latitudeGeographic or personal freedom
- chronometerPrecision timekeeping instrument
- maritimeOf the sea
- nauticalOf ships and sailing
Zulu · aviation · GPS · dateline · waypoint · flight planning · air traffic control · nautical almanac
Extending across Earth
- internationalConcerning relations among countries
- standardizationImplementing uniform technical specifications
- globalizationWorldwide economic and cultural integration
- synchronizationAligning timing across systems
coordination · dateline · world clock · global communication · satellite · intercontinental · broadcast
UTC
Universal time standard
- GMTGlobal time baseline
- synchronizationAligning timing across systems
- timekeepingMeasuring duration's passage
NTP · precision · radio broadcast · standardization · coordination
meridian
Pole-to-pole great circle
- prime meridianZero-degree longitude line
- observatoryFacility for celestial study
- Royal ObservatoryAstronomy institution at Greenwich
ephemeris · celestial · equinox · solar day · star catalog · celestial navigation · almanac · solar noon
longitude
East-west angular distance
- latitudeGeographic or personal freedom
- chronometerPrecision timekeeping instrument
- maritimeOf the sea
nautical · Zulu · aviation · GPS · dateline · waypoint · flight planning · air traffic control · nautical almanac · dead reckoning
worldwide
Extending across Earth
- internationalConcerning relations among countries
- standardizationImplementing uniform technical specifications
- globalizationWorldwide economic and cultural integration
synchronization · coordination · dateline · world clock · global communication · satellite · intercontinental · broadcast
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