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  2. File:Standard Time Zones of the World (October 2015).pdf

    en.wikipedia.org/wiki/File:Standard_Time_Zones...

    Date and time of digitizing: 10:09, 7 October 2015: Software used: PScript5.dll Version 5.2.2: File change date and time: 10:09, 7 October 2015: Conversion program: Acrobat Distiller 11.0 (Windows) Encrypted: no: Page size: 1512 x 1224 pts: Version of PDF format: 1.5

  3. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.

  4. Light-year - Wikipedia

    en.wikipedia.org/wiki/Light-year

    The product of Simon Newcomb's J1900.0 mean tropical year of 31 556 925.9747 ephemeris seconds and a speed of light of 299 792.5 km/s produced a light-year of 9.460 530 × 10 15 m (rounded to the seven significant digits in the speed of light) found in several modern sources [10] [11] [12] was probably derived from an old source such as C. W ...

  5. List of time zones by country - Wikipedia

    en.wikipedia.org/wiki/List_of_time_zones_by_country

    UTC−08:00 – Pacific Time zone: the Pacific coast states, the Idaho Panhandle and most of Nevada and Oregon UTC−07:00 – Mountain Time zone: most of Idaho, part of Oregon, and the Mountain states plus western parts of some adjacent states UTC−06:00 – Central Time zone: a large area spanning from the Gulf Coast to the Great Lakes

  6. File:Standard Time Zones of the World (August 2013).pdf

    en.wikipedia.org/wiki/File:Standard_Time_Zones...

    File change date and time: 06:34, 27 September 2013: Date and time of digitizing: 06:34, 27 September 2013: Conversion program: Acrobat Distiller 9.3.2 (Windows) Encrypted: no: Page size: 1512 x 936 pts: Version of PDF format: 1.7

  7. 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.

  8. Next Generation Science Standards - Wikipedia

    en.wikipedia.org/wiki/Next_Generation_Science...

    The Next Generation Science Standards is a multi-state effort in the United States to create new education standards that are "rich in content and practice, arranged in a coherent manner across disciplines and grades to provide all students an internationally benchmarked science education."

  9. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    The time zone using UTC is sometimes denoted UTC+00:00 or by the letter Z—a reference to the equivalent nautical time zone (GMT), which has been denoted by a Z since about 1950. Time zones were identified by successive letters of the alphabet and the Greenwich time zone was marked by a Z as it was the point of origin.

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