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  2. Alarm clock - Wikipedia

    en.wikipedia.org/wiki/Alarm_clock

    Alarm clock. An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or short naps; they can sometimes be used for other reminders as well. Most alarm clocks make sounds; some make light or vibration.

  3. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    Incense seal clocks had a disk etched with one or more grooves, into which incense was placed. [56] The length of the trail of incense, directly related to the size of the seal, was the primary factor in determining how long the clock would last; to burn 12 hours an incense path of around 20 metres (66 ft) has been estimated. [57]

  4. 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 ...

  5. Emergency Alert System - Wikipedia

    en.wikipedia.org/wiki/Emergency_Alert_System

    The Emergency Alert System ( EAS) is a national warning system in the United States designed to allow authorized officials to broadcast emergency alerts and warning messages to the public via cable, satellite and broadcast television and AM, FM and satellite radio. Informally, Emergency Alert System is sometimes conflated with its mobile phone ...

  6. ATL connection time frame. Is 1 hour enough? - Atlanta Forum

    www.tripadvisor.com/ShowTopic-g60898-i104-k...

    One hour is VERY TIGHT for a domestic to international connection (it's even tight for domestic to domestic, but much less risky). For most international flights they want you at the airport at least two hours before departure, and they frequently start boarding the plane an hour before takeoff (vs 30-40 minutes for a domestic flight).

  7. Striking clock - Wikipedia

    en.wikipedia.org/wiki/Striking_clock

    A striking clock is a clock that sounds the hours audibly on a bell, gong, or other audible device. In 12-hour striking, used most commonly in striking clocks today, the clock strikes once at 1:00 am, twice at 2:00 am, continuing in this way up to twelve times at 12:00 mid-day, then starts again, striking once at 1:00 pm, twice at 2:00 pm, and ...

  8. Clock - Wikipedia

    en.wikipedia.org/wiki/Clock

    Casio F-91W digital watch, one of the most popular watches ever. A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year. Devices operating on several physical ...

  9. Non-24-hour sleep–wake disorder - Wikipedia

    en.wikipedia.org/wiki/Non-24-hour_sleep–wake...

    Non-24-hour sleep–wake disorder ( non-24 [1] or N24SWD [2]) is one of several chronic circadian rhythm sleep disorders (CRSDs). It is defined as a "chronic steady pattern comprising [...] daily delays in sleep onset and wake times in an individual living in a society". [3] Symptoms result when the non-entrained ( free-running) endogenous ...

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