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  2. 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 ...

  3. 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 ...

  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. Outline of the history of the United States - Wikipedia

    en.wikipedia.org/wiki/Outline_of_the_history_of...

    Thomas Jefferson becomes the 3rd president of the United States on March 4, 1801. First Barbary War, 1801–1805. The Territory Northwest of the River Ohio is admitted to the Union as the State of Ohio (the 17th state) on March 1, 1803. The United States takes possession of the Louisiana Purchase, December 20, 1803.

  6. Historical rankings of presidents of the United States ...

    en.wikipedia.org/wiki/Historical_rankings_of...

    The 2011 survey, the first poll asking UK academics to rate American presidents, was conducted by the United States Presidency Centre (USPC) at the Institute for the Study of the Americas (located in the University of London's School of Advanced Study). This polled the opinion of British specialists in American history and politics to assess ...

  7. 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 ...

  8. Adams Synchronological Chart or Map of History - Wikipedia

    en.wikipedia.org/wiki/Adams_Synchronological...

    OCLC. 18434872. Adams Synchronological Chart or Map of History, originally published as Chronological Chart of Ancient, Modern and Biblical History is a wallchart that graphically depicts a Biblical genealogy alongside a timeline composed of historic sources from the history of humanity from 4004 BC to modern times .

  9. Date and time notation in the United States - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    In traditional American usage, dates are written in the month–day–year order (e.g. August 25, 2024) with a comma before and after the year if it is not at the end of a sentence [ 2] and time in 12-hour notation (1:23 am). International date and time formats typically follow the ISO 8601 format (2024-08-25) for all-numeric dates, [ 3] write ...

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