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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.
In most English-speaking regions, the 12-hour clock is the predominant form of representing the time of day physically, while the 24-hour clock is generally used for contexts where unambiguity and accurate timekeeping are important, such as for public transport schedules.
Before the adoption of four standard time zones for the continental United States, many towns and cities set their clocks to noon when the sun passed their local meridian, pre-corrected for the equation of time on the date of observation, to form local mean solar time. Noon occurred at different times but time differences between distant ...
The equation of time was engraved on sundials so that clocks could be set using the Sun. In 1720, Joseph Williamson claimed to have invented a clock that showed solar time, fitted with a cam and differential gearing, so that the clock indicated true solar time. [137] [138] [139]
The 24-hour analog dial continued to be used, but primarily by technicians, astronomers, scientists, and clockmakers. John Harrison, Thomas Tompion, and Mudge [7] built a number of clocks with 24-hour analog dials, particularly when building astronomical and nautical instruments. 24-hour dials were also used on sidereal clocks.
The following is a list of American companies that produced, or currently produce clocks. Where known, the location of the company and the dates of clock manufacture follow the name. Samuel Abbott; Montpelier, Vermont (1830–1861) Ansonia Clock Company; Ansonia, Connecticut and Brooklyn, New York (1851–1929)
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