page_title: 24-hour analog dial
section_title: World time
hierarchical_section_title: 24-hour analog dial / Watches / World time
caption_attribution_description: English: The Urania world clock in Berlin, Alexanderplatz. Deutsch: Die Urania-Weltzeituhr auf dem Alexanderplatz in Berlin.
context_page_description: Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day. The more familiar 12-hour analog dial has an hour hand that makes two complete revolutions in a day.
  Twenty-four-hour analog clocks and watches are used today by pilots, scientists, and the military, and are sometimes preferred because of the unambiguous representation of a whole day at a time. 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 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 are used twice, once for the morning hours, and once for the afternoon and evening hours. So VI 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.
context_section_description: 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.
caption: The World Time clock in Alexanderplatz, Berlin, Germany
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