Design
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. 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.
Read more about this topic: 24-hour Analog Dial
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