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  2. Area code 520 - Wikipedia

    en.wikipedia.org/wiki/Area_code_520

    Area code 520 is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of Arizona. The numbering plan area comprises Tucson and most of the southeastern part of the state. Area code 520 was created in a split of area code 602 on March 19, 1995. Previously, 602 had been the sole area code for the entire state of ...

  3. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    The first NXX block is the numbering plan area code. When the second and third digits are the same, the code is an easily recognizable code (ERC). ERCs designate special services; e.g., 800 for toll-free service. The NANP is not assigning area codes with 9 as the second digit. [37]

  4. Doomsday Clock - Wikipedia

    en.wikipedia.org/wiki/Doomsday_Clock

    It has since been set backward 8 times and forward 18 times. The farthest time from midnight was 17 minutes in 1991, and the nearest is 89 seconds, set in January 2025. [5] The Clock was moved to 150 seconds (2 minutes, 30 seconds) in 2017, then forward to 2 minutes to midnight in 2018, and left unchanged in 2019. [6]

  5. Time synchronization in North America - Wikipedia

    en.wikipedia.org/wiki/Time_synchronization_in...

    AC-100-WWVB Time Receiver; AC-500-MSF Time Receiver; ClockWatch Radio Sync [20] F6CTE's CLOCK [15] WWV: 2.5, 5, 10, 15, and 20 MHz AM Voice with modified IRIG-Hformat time code on 100 Hz sub-carrier (CCIR code) HF radio and antenna (plus software if automatic updating of computer time is desired) TrueTime TL-3 WWV Receiver

  6. Category:Area codes in Arizona - Wikipedia

    en.wikipedia.org/wiki/Category:Area_codes_in_Arizona

    Area code 520; Area codes 602, 480, and 623; Area code 623; Area code 928 This page was last edited on 24 December 2023, at 10:16 (UTC). ...

  7. Area codes 602, 480, and 623 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_602,_480,_and_623

    This meant that in-state toll and collect calls would require dialing the area code. [4] By the early 1990s, the need for a new area code could no longer be staved off. In 1993, Arizona was allocated a second area code, area code 520, for all of the state outside the Phoenix metropolitan area. [5] 520 was introduced on March 19, 1995 ...

  8. Hexadecimal time - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal_time

    A hexadecimal clock-face (using the Florence meridian) Hexadecimal time is the representation of the time of day as a hexadecimal number in the interval [0, 1). The day is divided into 10 16 (16 10) hexadecimal hours, each hour into 100 16 (256 10) hexadecimal minutes, and each minute into 10 16 (16 10) hexadecimal seconds.

  9. World clock - Wikipedia

    en.wikipedia.org/wiki/World_clock

    A world clock is a clock which displays the time for various cities around the world. The display can take various forms: The display can take various forms: The clock face can incorporate multiple round analogue clocks with moving hands or multiple digital clocks with numeric readouts, with each clock being labelled with the name of a major ...