24-hour analog dial
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). 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, 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 (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. 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.
Q376
Clocks
Concept
Q178794
watches
Concept
Q25235
hour
Concept
Q573
day
Concept
Q209499
12-hour analog dial
MISC
Q216589
24-hour clock system
UNK
Q80793
Sundials
Concept
Q1548498
24-hour analog dial
Concept
Q1548498
24-hour analog dial
Concept
Q1548498
24-hour analog dial
Concept
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subclass of
part of