Weems and Plath Endurance II 135 Barometer/Thermometer - Manual (Page 7)

24 Hour/Radio Room Clock - A Brief History:
We have combined two clocks in one. This innovative clock incorporates the
dial of a radio room clock with a 24 hour clock movement.
In most regions of the world, the time of day is customarily given using the
12-hour clock method which counts the hours of the day from 1 to 12 twice
daily. These two sequences of twelve hours are differentiated with the use of
the suffixes a.m and p.m. These suffixes are abbreviations for the Latin terms,
Ante Meridian and Post Meridian, meaning before midday and after midday.
For clarity, to distinguish the time at 12 a.m. or p.m., it is suggested to specify
12 noon or 12 midnight instead. Even this designation
can be confusing for legal contracts and time schedules.
To resolve the confusion sometimes caused by the
12-hour clock notation, the 24-hour clock is a method
of timekeeping in which the day runs from midnight
to midnight and is divided into 24 hour increments,
indicating the hours from 0 (midnight) to 23. This 24
hour format is sometimes referred to as military time or
astronomical time. It has also been called railway time
and continental time and is the standard used by the
International Organization of Standards (ISO 8601)
to avoid misinterpretation of numeric representations
between countries with different conventions for writing
numeric times. This method of telling time also prevents
ambiguity in specific avocations that require accuracy
such as aviation, navigation, meteorology, astronomy,
computing, logistics and emergency services.
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