World clock

The Weltzeituhr (Worldtime Clock) at Alexanderplatz in Berlin

For World Clock,Hussein mohammeds

which is actually an astronomical clock, see Jens Olsen's World Clock

A world clock is a clock which displays the time for various cities around the world. The display can take various forms:

The clock face can incorporate multiple round analogue clocks with moving hands or multiple digital clocks with numeric readouts, with each clock being labelled with the name of a major city or time zone in the world.
It could also be a picture map of the world with embedded analog or digital time-displays.
A moving circular map of the world, rotating inside a stationary 24-hour dial ring. Alternatively, the disc can be stationary and the ring moving.
Light projection onto a map representing daytime, used in the Geochron, a brand of a particular form of world clock.

There are also worldtime watches, both wrist watches and pocket watches. Sometime manufacturers of timekeepers erroneously apply the worldtime label to instruments that merely indicate time for two or a few time zones, but the term should be used only for timepieces that indicate time for all major time zones of the globe.

Chronometry	UTC UT TAI Unit of time Planck time Second Minute Hour Day Week Month Year Decade Century Millennium Tropical year Solar year Sidereal year

Measurement systems	Time zone 12-hour clock 24-hour clock Daylight saving time New Earth Time Solar time Sidereal time Metric time Decimal time Hexadecimal time

Calendars	Gregorian Julian Hebrew Islamic Lunar Solar Hijri Mayan Intercalation Leap second Leap year

Clocks

Chronology
History

Religion
Mythology

Philosophy of time

Human experience
and use of time

Time in

Geology	Geological time age chron eon epoch era period Geochronology Geological history of Earth

Physics	Absolute time and space Arrow of time Chronon Coordinate time Imaginary time Planck epoch Planck time Proper time Rate Spacetime Theory of relativity Time dilation gravitational Time domain T-symmetry

other subject areas	Chronobiology Circadian rhythms Dating methodologies in archaeology Time geography

Related topics

Time portal

Time measurement and standards

Chronometry Orders of magnitude Metrology

International standards	UTC UTC offset UT ΔT DUT1 IERS ISO 31-1 ISO 8601 TAI 12-hour clock 24-hour clock Barycentric Coordinate Time Barycentric Dynamical Time Civil time Daylight saving time Geocentric Coordinate Time International Date Line Leap second Solar time Terrestrial Time Time zone

Obsolete standards	Ephemeris time Greenwich Mean Time Prime meridian

Time in physics	Absolute time and space Spacetime Chronon Continuous time Coordinate time Cosmological decade Discrete time Planck epoch Planck time Proper time Theory of relativity Time dilation Gravitational time dilation Time domain T-symmetry

Horology	Clock Astrarium Atomic clock Complication History of timekeeping devices Hourglass Marine chronometer Marine sandglass Radio clock Watch Water clock Sundial Dialing scales Equation of time History of sundials Sundial markup schema

Calendar	Astronomical Dominical letter Epact Equinox Gregorian Hebrew Hindu Intercalation Islamic Julian Leap year Lunar Lunisolar Solar Solstice Tropical year Weekday determination Weekday names

Archaeology and geology	Dating methodologies Geologic time scale International Commission on Stratigraphy

Astronomical chronology	Galactic year Nuclear timescale Precession Sidereal time

Units of time	Century Day Decade Fortnight Hour Jiffy Lustrum Millennium Minute Moment Month Paksha Saeculum Second Shake Tide Week Year

Related topics	Chronology Duration Mental chronometry Metric time System time Time value of money Timekeeper

Authority control	GND: 7606633-2

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World clock

See also