World clock

• 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.