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  2. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from 00 (:00) to 23 (:59), with 24 (:00) as an option to indicate the end of the day. This system, as opposed to the 12-hour clock, is the ...

  3. Military designation of days and hours - Wikipedia

    en.wikipedia.org/wiki/Military_designation_of...

    H-Hour. The specific time at which an operation or exercise commences, or is due to commence (this term is used also as a reference for the designation of days/hours before or after the event). (NATO); also known as 'Zero Hour'. I-Day. Used informally within the U.S. military bureaucracy to variously designate the "Implementation Day" or the ...

  4. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    The 24-hour clock is the most commonly used method worldwide to physically represent the time of day. Some regions utilize 24-hour time notation in casual speech as well, such as regions that speak German, French, or Romanian, though this is less common overall; other countries that utilize the 24-hour clock for displaying time physically may ...

  5. List of United States Marine Corps acronyms and expressions

    en.wikipedia.org/wiki/List_of_United_States...

    Military Time – The time of day on a 24-hour clock. General Wallace M. Greene forbade the practice of suffixing the unnecessary word "hours" after each indication of time of day ("1330" or "thirteen-thirty" instead of "1330 hours"); the practice of saying "oh" instead of "zero" for hours before 1000 has diminished as well. MOPP equipment

  6. 24-hour analog dial - Wikipedia

    en.wikipedia.org/wiki/24-hour_analog_dial

    The 24th hour on the right side of the dial is typical for the old Italian time system of 24 hours counted from dusk. 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 ...

  7. D-Day Daily Telegraph crossword security alarm - Wikipedia

    en.wikipedia.org/wiki/D-Day_Daily_Telegraph...

    As a result, war-related words including those codenames got into the crosswords; Dawe said later that at the time he did not know that these words were military codewords. On 18 August 1942, a day before the Dieppe raid , 'Dieppe' appeared as an answer in The Daily Telegraph crossword (set on 17 August 1942) (clued "French port"), causing a ...

  8. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The first clock known to strike regularly on the hour, a clock with a verge and foliot mechanism, is recorded in Milan in 1336. [96] By 1341, clocks driven by weights were familiar enough to be able to be adapted for grain mills, [97] and by 1344 the clock in London's Old St Paul's Cathedral had been replaced by one with an escapement. [98]

  9. Military time zone - Wikipedia

    en.wikipedia.org/wiki/Military_time_zone

    The military time zones are a standardized, uniform set of time zones for expressing time across different regions of the world, named after the NATO phonetic alphabet. The Zulu time zone (Z) is equivalent to Coordinated Universal Time (UTC) and is often referred to as the military time zone. The military time zone system ensures clear ...