24-hour analog dial

Twenty-four-hour analog clocks and watches are used today by logistics workers, fire fighters, police officers, paramedics, nurses, pilots,[1] scientists,[2] and the military,[3] and are sometimes preferred because of the unambiguous representation of a whole day at a time.

[6] In Italy, the numbers from 1 to 24 (I to XXIV in Roman numerals) were used, leading to the widespread use of the 24-hour system in that country.

This probably reflects the influence of the Italian timekeeping system, which started counting the hours of the day at sunset or twilight.

John Harrison, Thomas Tompion, and Mudge[7] built a number of clocks with 24-hour analog dials, particularly when building astronomical and nautical instruments.

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.

Manufacturers who make 24-hour analog watches include Glycine, Raketa, Vostok, Fortis, Poljot, Swatch, and many others.

The face of a 24-hour watch 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.

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.

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!

A watch with a 24-hour analog dial is important to the resolution of Alfred Bester's 1953 short story "The Roller Coaster".

Tower clock in Martinengo, province of Bergamo, Lombardy. The 24th hour on the right side of the dial is typical for the old Italian time system of 24 hours counted from dusk.
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
Sundial with 24-hour analog dial
The World Clock in Alexanderplatz , Berlin, Germany