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The World Clock ( German: Weltzeituhr ), also known as the Urania World Clock (German: Urania-Weltzeituhr ), is a large turret-style world clock located in the public square of Alexanderplatz in Mitte, Berlin. By reading the markings on its metal rotunda, the current time for 148 major cities from around the world can be determined. [1]
Geochron. Geochron, Inc. is an American company founded in 1965 by James Kilburg, [1] an inventor from Luxembourg. It is also the name of their flagship product, the Geochron Global Time Indicator. The Geochron was the first world clock to display day and night on a world map, showing the familiar "bell curve" of light and darkness.
Google Earth is a computer program that renders a 3D representation of Earth based primarily on satellite imagery. The program maps the Earth by superimposing satellite images, aerial photography, and GIS data onto a 3D globe, allowing users to see cities and landscapes from various angles. Users can explore the globe by entering addresses and ...
It is sometimes incorrectly said that the user location is at the intersection of three spheres. While simpler to visualize, this is the case only if the receiver has a clock synchronized with the satellite clocks (i.e., the receiver measures true ranges to the satellites rather than range differences).
Time and frequency transfer is a scheme where multiple sites share a precise reference time or frequency. The technique is commonly used for creating and distributing standard time scales such as International Atomic Time (TAI). Time transfer solves problems such as astronomical observatories correlating observed flashes or other phenomena with ...
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 ...
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