24 Hour Analog Clock

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A 24-hour watch made by Russian watchmaker Raketa; the time shows 20:10 which, if on a 12-hour watch, would show 8:10 pm.

Today[edit]

A sundial showing all 24 hours; impractical but symmetrical.

Shepherd Gate clock outside the Royal Observatory, Greenwich. The clock at Ottery St Mary, England, showing nearly noon, using the 12-hour time system on a 24-hour analog dial. The 24-hour tower clock in Venice that uses double-XII system. Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution).

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The more familiar 12-hour analog dial has an hour hand that makes two complete revolutions in a day (12 hours per revolution). Twenty-four-hour analog clocks and watches are used today by pilots,[1] scientists,[2] and the military,[3] and are sometimes preferred because of the unambiguous representation of a whole day at a time.

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See also[edit]

Note that this definition refers to the use of a complete circular dial to represent a 24-hour day.

Using the numbers from 0 to 23 (or 1 to 24) to mark the day is the 24-hour clock system. Sundials use 24-hour analog dials—the shadow traces a path that repeats approximately once per day.Many sundials are marked with the double-XII or double-12 system, in which the numbers I to XII (or 1 to 12) are used twice, once for the morning hours, and once for the afternoon and evening hours.

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So VI (or 6) appears twice on many dials, once near sunrise and once near sunset. Modern 24-hour analog dials—other than sundials—are almost always marked with 24 numbers or hour marks around the edge, using the 24-hour clock system. These dials do not need to indicate AM or PM. The ancient Egyptians divided the day into 24 hours.

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There are diagrams of circles divided into 24 sections in the astronomical ceiling in the tomb of Senemut.[4].

Sundial with 24-hour analog dial. Sundials use some or all of the 24-hour dial, because they show the position of the sun in the sky. Sometimes, for aesthetic rather than practical reasons, all the 24 hour marks are shown. The famous Big Ben clock in London has a 24-hour dial as part of the mechanism, although it is not visible from the outside.[8].

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In the 20th century, the 24-hour analog dial was adopted by radio amateurs, pilots, submariners, and for military use. 24-hour analog watches and clocks are still being manufactured today, and are sought after by collectors and enthusiasts. Manufacturers who make 24-hour analog watches include Glycine, Raketa, Vostok, Fortis, Poljot, Swatch, and many others.

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Swatch 24-hour watch. 24-hour chronograph by Hamilton.

A modern quartz clock with a 24-hour face.

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A simple 24 hour clock showing the approximate position of the sun.

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The major variation in the design of 24-hour analog dials is the location of midnight and noon.

Although always opposite each other, 180° apart, noon is sometimes at the top, sometimes at the bottom. A few rare variants place noon and midnight at the right and left sides.[9] There is no ambiguity if the 24-hour numbering is used. In the United States, the government and military commonly use 24-hour clocks having noon at the bottom; the variant with noon at the top is far less common.[citation needed].

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24-hour chronograph by Hamilton. A 24-hour watch is a type of watch with an hour hand that completes a revolution every 24 hours. The face may be arranged in either of two ways: with noon at the top and midnight at the bottom (similar to how one might observe the passage of the Sun over their time zone whilst facing south), or else rotated 180° with midnight at the top and noon at the bottom (as pictured).

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Multiple time zones can be displayed by having multiple hour hands or a rotating bezel.

The bezel is a ring around the outside of the watch's face. When it is used, the top of the watch always represents midnight (or noon) GMT. The bezel, which also has hour markings, is then rotated so that its numbering represents local time.

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So, a pilot always has GMT time available for talking to air traffic control and, when they land, only has to rotate the bezel to "set" the watch to their new local time. Glycine was the first to feature a 24-hour rotating bezel in 1953 with the Airman No.1 Pilot watch.

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The design became widely known when Rolex designed the Rolex GMT Master for Pan-Am Pilots in 1954.

A 24-hour watch with a compass card dial can be used to determine direction when set to local noon and used in conjunction with the sun. Many (but not all) digital watches can be set to show the time in 24-hour format. Akerfalk (Swedish). Glycine watch (Swiss). Poljot (Russian).

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Raketa (USSR Russian). Slow watch (Swiss). The World Clock in Alexanderplatz, Berlin, Germany. A common use for the 24-hour analog method of representing time is for showing the way the time of day depends on one's location. A globe, map, or disk can be used. The Willis World Clock, which shows a stylized map of the world, helping to indicate the time in different time zones.

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George Orwell uses the 12-hour and 24-hour dials to symbolize the old and new worlds in his novel Nineteen Eighty-Four.

The 12-hour dial is a relic of pre-revolutionary society, used to represent the desirable past; the 24-hour dial and time system is the compulsory standard imposed by the Party, and represents both conformity and the undesirable nature of the new world. This theme is famously set in the opening line:. In the 1927 film Metropolis, the opening scene shows both a 24-hour analog clock and a 10-hour (decimal) analog clock, one above the other.

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Both are used to convey the impression of an alien and highly efficient society. In Jules Verne's science fiction masterpiece 20000 Leagues Under the Sea, Captain Nemo remarks that the clocks in the Nautilus use a 24-hour dial: "Now, look at that clock: it's electric, it runs with an accuracy rivaling the finest chronometers. I've had it divided into twenty–four hours like Italian clocks, since neither day nor night, sun nor moon, exist for me, but only this artificial light that I import into the depths of the seas!

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See, right now it's ten o'clock in the morning." ^""Glycine Watch"".

Archived from the original on 2011-07-11. Retrieved 20 February 2018. ^"Sidereal Clock". Retrieved 20 February 2018. ^""Marathon Marine clock designed for military use"". Archived from the original on 2012-03-10. Retrieved 20 February 2018. ^"ANISTORITON: Viewpoints". Retrieved 20 February 2018. ^ abcGeared to the Stars: The Evolution of Planetariums, Orreries, and Astronomical Clocks, Henry C King, University of Toronto Press; (1978).

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^Gerhard Dohrn-van Rossum (1996). History of the hour: clocks and modern temporal orders. University of Chicago Press. ^The British Museum Clocks, David Thompson, British Museum Press, 2004. ^"UK Parliament photograph on Flickr". ^"Everest Watchworks Sales". everestwatchworks.com. Retrieved 20 February 2018.

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Retrieved from "https://en.wikipedia.org/w/index.php?title=24-hour_analog_dial&oldid=1063065832".

Modified9 years, 5 months ago. I'm attempting to make a 24 hour analog clock and currently have a 12 hour clock. This works perfectly for a 12 hour clock but I would like to make it 24 so I was advised to divide my angle values by 2 like this:. However this gives me a top to bottom 180 degree angle which resets after reaching the 180 degrees.

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What do I need to change to get a full 360 degree rotation for my clock? Clearly, the angles for minutes and seconds don't change. Only the hour angle is halved. Also, be sure that hour reaches all values up to 23. 44 gold badges4343 silver badges6464 bronze badges. 6464 bronze badges. What you want to do is to wrap the 24 hour clock to 12 hour rotations, you can use a modulo for this like so:.

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I created a project that makes an analog style clock which is available here PSAnalogClock. I used this to work out the hours. EDIT - thanks to @nes1983. Then to calculate the angle I used. 55 gold badges6868 silver badges8787 bronze badges. 8787 bronze badges. not a direct answer, more like an additional perspective. ;) the following piece of code is taken from the app elastic time clock, which is available on the AppStore and was written by Your Headless Standup Programmer.

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without much explaining, maybe it gives You some extra insight into timelessness taking a look at the cocos2d step method ii wrote for elastic time clock:. if one would have set the h13Ratio variable to have a value like this:. the h13Ratio would be 2. which makes sense, since there is twice as much numbers on the clock face. The 24-hour clock runs from midnight to midnight and is divided into 24 hours instead of 12!

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14" ZULUTIME™ Antique Brass 24-Hour Clock