Greenwich
Zero longitude's home
Greenwich is a district in southeast London, historically significant as the site of the Royal Observatory and the prime meridian (0° longitude).
Times worldwide are measured relative to Greenwich Mean Time (GMT): The flight arrives at 3 PM Greenwich time.
In American usage, Greenwich often refers to Greenwich, Connecticut, an affluent suburb of New York City.
Global time baseline
- UTCUniversal time standard
- time zonesRegional clock-setting divisions
- world clockMulti-timezone time display
- synchronizationAligning timing across systems
standard time · mean time · atomic time · solar time · timekeeping · time signal · 24-hour clock · chronometry
Preserved Victorian clipper
- clipper shipFast multi-masted sailing vessel
- ThamesLondon's river
- dockyardMaritime vessel construction site
- naval collegeMilitary school for sailors
seafaring · anchor · compass · vessel · sailor · mariner · admiral · fleet
East-west angular distance
- coordinatesLocation-specifying number pairs
- baselineStandard for comparison
- Eastern HemisphereEarth's longitudinal half containing continents oldest-known
- Western HemisphereEarth's American half
cartography · world map · geography · global positioning · hemispheres · reference line · geodesy · mapping
Astronomy institution at Greenwich
- telescopeInstrument magnifying faraway objects
- HalleyAstronomer's surname, comet fame
- astronomerCelestial bodies researcher
- celestialOf the sky above
dome · planetarium · astronomy · stargazing · equatorial · refractor · precision instruments
Antlered hoofed mammal
- panoramaUnobstructed wide-angle view
- London skylineCapital's architectural horizon
- chestnut treesDeciduous nut-producing hardwoods
- flower gardenPlanted area for ornamental blooms
bandstand · Roman ruins · picnic · hilltop · avenue · wilderness
Sixteenth-century English ruling family
- PlacentiaCity in Orange County
- Elizabeth IFinal Tudor sovereign
- hunting groundsArea for pursuing game
- royal parkMonarch-owned public grounds
Henry VIII · Stuart · Charles II · Inigo Jones · Palladian · crown · monarchy · royal residence
GMT
Global time baseline
- UTCUniversal time standard
- time zonesRegional clock-setting divisions
- world clockMulti-timezone time display
synchronization · standard time · mean time · atomic time · solar time · timekeeping · time signal · 24-hour clock · chronometry · horology
Cutty Sark
Preserved Victorian clipper
- clipper shipFast multi-masted sailing vessel
- ThamesLondon's river
- dockyardMaritime vessel construction site
naval college · seafaring · anchor · compass · vessel · sailor · mariner · admiral · fleet · harbor
longitude
East-west angular distance
- coordinatesLocation-specifying number pairs
- baselineStandard for comparison
- Eastern HemisphereEarth's longitudinal half containing continents oldest-known
Western Hemisphere · cartography · world map · geography · global positioning · hemispheres · reference line · geodesy · mapping · surveying
Royal Observatory
Astronomy institution at Greenwich
- telescopeInstrument magnifying faraway objects
- HalleyAstronomer's surname, comet fame
- astronomerCelestial bodies researcher
celestial · dome · planetarium · astronomy · stargazing · equatorial · refractor · precision instruments
deer
Antlered hoofed mammal
- panoramaUnobstructed wide-angle view
- London skylineCapital's architectural horizon
- chestnut treesDeciduous nut-producing hardwoods
flower garden · bandstand · Roman ruins · picnic · hilltop · avenue · wilderness
Tudor
Sixteenth-century English ruling family
- PlacentiaCity in Orange County
- Elizabeth IFinal Tudor sovereign
- hunting groundsArea for pursuing game
Henry VIII · royal park · Stuart · Charles II · Inigo Jones · Palladian · crown · monarchy · royal residence · courtiers
- ConnecticutHartford, New Haven, Stamford, Bridgeport, Norwalk
- London AreasCamden, Westminster, Islington, Southwark, Hammersmith
- NYC SuburbsYonkers, Roslyn, Hoboken, Fort Lee, Montclair
- -wich PlacesNorwich, Ipswich, Sandwich
- Thames EstuaryThames Barrier, River Thames, tidal range, mudflats, salt marshes
- time conceptsclock, calendar, hour, minute, second
- Greenwich VillageManhattan's bohemian quarter
- Greenwich Mean TimePrime meridian reference hour
- Greenwich ObservatoryLongitude reference point facility
- Greenwich timeZero-longitude reference hour
- Greenwich meridianZero-degree longitude line