GMT
Prime meridian hours
GMT stands for Greenwich Mean Time, the time at the prime meridian running through Greenwich, England.
It serves as a global reference point for coordinating time zones: The meeting is scheduled for 3 PM GMT.
Though largely replaced by Coordinated Universal Time (UTC) for technical purposes, GMT remains common in everyday usage, especially in British contexts.
Universal time standard
- ZuluBantu language of Natal
- atomic clockQuantum-vibration timekeeping device
- chronometerPrecision timekeeping instrument
- synchronizationAligning timing across systems
accuracy · calibration · timekeeping · 24-hour clock · radio-controlled · horology · observatory · precision
Zero-degree longitude line
- meridianPole-to-pole great circle
- Royal ObservatoryAstronomy institution at Greenwich
- geodesyEarth measurement science
- cartographyCreating geographic representations
navigation · east · west · hemisphere · global positioning · longitude · world map
Nordic island republic
- AzoresMid-Atlantic Portuguese territory
- ReykjavikIceland's capital city
- LisbonPortugal's largest city
- DublinIrish capital city
London · Accra · Casablanca · Dakar · Monrovia · offset · daylight saving
Of ships and sailing
- maritimeOf the sea
- celestial navigationLocation-finding via astronomical observation
- sextantMaritime angular measurement device
- marine chronometerPrecise nautical timekeeping instrument
dead reckoning · nautical almanac · astronomical observation · naval · seafaring
Relating to outer space
- ephemerisCelestial body position chart
- celestialOf the sky above
- equinoxSun crosses celestial midline
- astronomerCelestial bodies researcher
UTC
Universal time standard
- ZuluBantu language of Natal
- atomic clockQuantum-vibration timekeeping device
- chronometerPrecision timekeeping instrument
synchronization · accuracy · calibration · timekeeping · 24-hour clock · radio-controlled · horology · observatory · precision · standardization
prime meridian
Zero-degree longitude line
- meridianPole-to-pole great circle
- Royal ObservatoryAstronomy institution at Greenwich
- geodesyEarth measurement science
cartography · navigation · east · west · hemisphere · global positioning · longitude · world map
Iceland
Nordic island republic
Dublin · London · Accra · Casablanca · Dakar · Monrovia · offset · daylight saving
nautical
Of ships and sailing
- maritimeOf the sea
- celestial navigationLocation-finding via astronomical observation
- sextantMaritime angular measurement device
marine chronometer · dead reckoning · nautical almanac · astronomical observation · naval · seafaring
astronomical
Relating to outer space