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  2. Military time zone - Wikipedia

    en.wikipedia.org/wiki/Military_time_zone

    The military time zone system ensures clear communication in a concise manner, and avoids confusion when coordinating across time zones. The CCEB , representing the armed forces of Australia, Canada, New Zealand, the United Kingdom, and the United States, publishes the military time zone system as the ACP 121 standard. [1]

  3. History of time in the United States - Wikipedia

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

    The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.

  4. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_States

    In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time (DST) for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the Department of Transportation, but no ...

  5. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752". [1] Old Style ( O.S.) and New Style ( N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in ...

  6. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    Coordinated Universal Time ( UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communication, navigation, scientific research, and commerce. UTC has been widely embraced by most countries and ...

  7. Standard time - Wikipedia

    en.wikipedia.org/wiki/Standard_time

    Standard time. Standard time is the synchronization of clocks within a geographical region to a single time standard, rather than a local mean time standard. Generally, standard time agrees with the local mean time at some meridian that passes through the region, often near the centre of the region. Historically, standard time was established ...

  8. St. Louis–San Francisco 1630 - Wikipedia

    en.wikipedia.org/wiki/St._Louis–San_Francisco_1630

    St. Louis–San Francisco Railway 1630 is a preserved class "Ye" 2-10-0 type steam locomotive owned and operated by the Illinois Railway Museum in Union, Illinois. Today, Frisco No. 1630 is currently one of two operating Decapods in service in America , the other being former Great Western No. 90 at the Strasburg Rail Road outside of Strasburg ...

  9. Nautical time - Wikipedia

    en.wikipedia.org/wiki/Nautical_time

    Nautical time. Nautical time is a maritime time standard established in the 1920s to allow ships on high seas to coordinate their local time with other ships, consistent with a long nautical tradition of accurate celestial navigation. Nautical time divides the globe into 24 nautical time zones with hourly clock offsets, spaced at 15 degrees by ...