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  2. Military time zone - Wikipedia

    en.wikipedia.org/wiki/Military_time_zone

    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.

  3. 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 ...

  4. Date-time group - Wikipedia

    en.wikipedia.org/wiki/Date-time_group

    In communications messages, a date-time group ( DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC). [citation needed] The order in which these elements are ...

  5. List of Winchester models - Wikipedia

    en.wikipedia.org/wiki/List_of_Winchester_models

    Model 1876 lever-action centerfire rifle. Model 1878 Hotchkiss bolt-action rifle (US Army and Navy) Model 1885 falling-block single-shot rifle. Model 1886 lever-action centerfire rifle. Model 1887 lever-action shotgun. Model 1890 slide-action .22 WRF rifle. Model 1892 lever-action centerfire rifle.

  6. History of time in the United States - Wikipedia

    en.wikipedia.org/wiki/History_of_time_in_the...

    The history of standard time in the United States began November 18, 1883, when United States and Canadian railroads instituted standard time in time zones. Before then, time of day was a local matter, and most cities and towns used some form of local solar time, maintained by some well-known clock (for example, on a church steeple or in a ...

  7. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    History of timekeeping devices. A marine sandglass. It is related to the hourglass, nowadays often used symbolically to represent the concept of time. The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky. Devices and methods for keeping time have gradually ...

  8. Daylight saving time in the United States - Wikipedia

    en.wikipedia.org/wiki/Daylight_saving_time_in...

    The Uniform Time Act of 1966 established a uniform set of rules for states opting to observe daylight saving time. [ 1] In the U.S., daylight saving time starts on the second Sunday in March and ends on the first Sunday in November, with the time changes taking place at 2:00 a.m. local time. With a mnemonic word play referring to seasons ...

  9. 1951 USAF resolution test chart - Wikipedia

    en.wikipedia.org/.../1951_USAF_resolution_test_chart

    A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...

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