time zones
Earth's hourly bands
Time zones are regions of the Earth that observe the same standard time, dividing the globe into roughly 24 segments corresponding to hours of the day.
Before railroads, towns kept local solar time; standardized zones solved the chaos of scheduling across distances.
What time zone are you in?
The meeting is at 3 p.m. Eastern time.
Crossing time zones causes jet lag.
Pole-to-pole great circle
- longitudeEast-west angular distance
- prime meridianZero-degree longitude line
- International Date LineLongitude where calendar shifts
- equatorMidpoint circle of rotation
hemisphere · coordinates · latitude · boundaries · borders · regions · mapping · atlas
UTC minus five
Universal time standard
- GMTGlobal time baseline
- GreenwichLondon district, meridian origin
- synchronizationAligning timing across systems
- universalAffecting all equally
coordination · calibration · offset · adjustment · atomic clock · reference · regulation · uniformity
Multi-participant telephone discussions
- schedulingAssigning times to events
- remote workEmployment from afar
- virtual meetingsRemote digital gatherings
- coordinationOrganized cooperative movement
availability · asynchronous · multinational · working hours · trading · outsourcing · cross-border · collaboration
Post-flight sleep disruption
- layoverBreak between connecting flights
- arrivalAct of reaching destination
- departureAct of going away
- itineraryPlanned sequence of destinations
flight schedule · connecting flights · red-eye · circadian · adjustment · crossing · transit · international travel
meridian
Pole-to-pole great circle
- longitudeEast-west angular distance
- prime meridianZero-degree longitude line
- International Date LineLongitude where calendar shifts
equator · hemisphere · coordinates · latitude · boundaries · borders · regions · mapping · atlas · cartography
EST
UTC minus five
UTC
Universal time standard
- GMTGlobal time baseline
- GreenwichLondon district, meridian origin
- synchronizationAligning timing across systems
universal · coordination · calibration · offset · adjustment · atomic clock · reference · regulation · uniformity · timekeeping
conference calls
Multi-participant telephone discussions
- schedulingAssigning times to events
- remote workEmployment from afar
- virtual meetingsRemote digital gatherings
coordination · availability · asynchronous · multinational · working hours · trading · outsourcing · cross-border · collaboration
jet lag
Post-flight sleep disruption
itinerary · flight schedule · connecting flights · red-eye · circadian · adjustment · crossing · transit · international travel · long-haul
- time traditionsdaylight saving, leap year, calendar systems, New Year countdown, clock watching
- 20th century world mapsatlas, globe, world atlas, map legend, map key
- almanac contentsencyclopedia, yearbook, annual, calendar, weather data
- geographic datapopulation density, land area, square miles, area, highest point
- territory datapopulation figures, land area, capital cities, population density, country codes
- universal standardmetric system, ISO, UTC, SI units, Celsius
time zonesUTC
Universal time standard
world clock · Greenwich Mean Time · GMT · world time · absolute time