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. The World Clock in Alexanderplatz displays 146 cities in all 24 time zones on its head.^[2][3]
• 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.

The Weltzeituhr (World Clock) at Alexanderplatz in Berlin^[1]

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.

See also

• Manege Square, Moscow
• Time zone
• Jens Olsen's World Clock (actually an astronomical clock)

References

1. Helmut Caspar: Ärger mit der Weltzeituhr am Alex. Städtenamen sind nicht korrekt. In: Märkische Allgemeine Zeitung, 24/25 December 1997.
2. Team, Berlin Hub (2016-04-01). "The History Of The World Clock In 1 Minute". Culture Trip. Archived from the original on 2022-12-09. Retrieved 2022-12-09.
3. "Berlin: A World Clock for those who Could Not Travel the World". The Berlin Spectator. 2021-03-12. Archived from the original on 2022-12-01. Retrieved 2022-12-09.