This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Projection clock" – news · newspapers · books · scholar · JSTOR(February 2012) (Learn how and when to remove this message)
A projection clock (also called ceiling clock) is an analogue or digital clock equipped with a projector that creates an enlarged image of the clock face or display on any surface usable as a projection screen, most often the ceiling.[1]
The clock can be placed almost anywhere if only the projected image must be seen. The image generated by most projection clocks is large enough that a nearsighted person can see it from a distance without glasses or contact lenses. Clocks usually have a conventional display on their body, in addition to the projector,
Projection clocks are also used in advertising and merchandising. High-brightness analogue projection clocks can superimpose a business' logo on top of the clock face, while there are low-brightness projection clocks designed for home use that project, for example, a logo in addition to the time.
Some projection clocks are radio-controlled, synchronising with a broadcast time standard and always displaying the right time without the need to set them. They may also display other information such as temperature and humidity.
^"The 7 Best Projection Alarm Clocks". Redshed. Retrieved 12 June 2019.
A projectionclock (also called ceiling clock) is an analogue or digital clock equipped with a projector that creates an enlarged image of the clock face...
cuckoo clocks Metrology Mora clock National Association of Watch and Clock Collectors Projectionclock Replica watch Rubik's Clock Star clock Singing...
stereographic projection is a perspective projection of the sphere, through a specific point on the sphere (the pole or center of projection), onto a plane...
stereographic projection of the ecliptic plane using the North pole as the basis of the projection. This is commonly seen in astronomical clocks of the period...
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...
An astronomical clock, horologium, or orloj is a clock with special mechanisms and dials to display astronomical information, such as the relative positions...
Retrieved 15 May 2023. National annual projection"Democratic People's Republic of Korea Population Projection (2014–2050)" (PDF). who.int. 1 October 2020...
use an astrolabe-style display, such as the famous clock at Prague, adopting a stereographic projection (see below) of the ecliptic plane. In recent times...
clock is a clock that sounds the hours audibly on a bell, gong, or other audible device. In 12-hour striking, used most commonly in striking clocks today...
Population Clock". Statistics New Zealand. Retrieved 30 August 2015. "Official Population Clock". Retrieved 30 August 2015. "U.S. and World Population Clock"....
horological treatise. The clock tower had 133 different clock jacks to indicate and sound the hours. Su Song's treatise about the clock tower, Xinyi Xiangfayao...
"Population clock and pyramid". abs.gov.au. 23 March 2024. Retrieved 23 March 2024. "Democratic People's Republic of Korea Population Projection (2014–2050)"...
November 2017. uses the solar projection of a graph of the equation of time intersecting a time scale to display clock time directly. An analemma may...
Eschinardi was also the first to provide information about the nocturnal projectionclock invented by Matteo Campani-Alimenis. Historians of science today emphasize...
the first DLP based projector was introduced by Digital Projection Ltd in 1997. Digital Projection and Texas Instruments were both awarded Emmy Awards in...
navigation. A dominant feature of most planetariums is the large dome-shaped projection screen onto which scenes of stars, planets, and other celestial objects...
with the game clock, a timekeeper may be needed to manage clocks other gameplay clocks, including play clocks, pitch clocks, and shot clocks. In business...
would peak before 2100. Others have challenged many recent population projections as having underestimated population growth. The world human population...
magnetron. Trochotrons were used in the UNIVAC 1101 computer, as well as in clocks and frequency counters. The first trochotrons were surrounded by a hollow...
– World countries mapped by population size Population clocks U.S. and World Population Clock (US Census Bureau) World Population Clock – Worldometer...
Episcopalian. In 1942 Spilhaus first wrote about the possibility of a map projection of the world's oceans that would intersect the oceans as little as possible...
uses a southern projection, as was characteristic for 15th-century astronomical clocks; all later such clocks use a northern projection. This would seem...
seven, six, five, four, three, two, one." After a launch, most countdown clocks begin to show Mission Elapsed Time, which is typically shown as "T plus...
modeling celestial motion. In 1348, Giovanni Dondi built the first known clock driven mechanism of the system. It displays the ecliptic position of the...
Doomsday Clock #1 (November 2017). DC Comics. Doomsday Clock #2 (December 2017). DC Comics. Doomsday Clock #3 (January 2018). DC Comics. Doomsday Clock #7 (September...
Global Information