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  2. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    Huygens first used a clock to calculate the equation of time (the difference between the apparent solar time and the time given by a clock), publishing his results in 1665. The relationship enabled astronomers to use the stars to measure sidereal time , which provided an accurate method for setting clocks.

  3. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    In American English, the term military time is a synonym for the 24-hour clock. [8] In the US, the time of day is customarily given almost exclusively using the 12-hour clock notation, which counts the hours of the day as 12, 1, ..., 11 with suffixes a.m. and p.m. distinguishing the two diurnal repetitions of this sequence.

  4. Sign-on and sign-off - Wikipedia

    en.wikipedia.org/wiki/Sign-on_and_sign-off

    Some broadcasters that have ceased signing on and signing off in favour of 24-hour broadcasting may perform a sign-off sequence at a certain time in the night (usually between 10:00 p.m. and 1:00 a.m.) as a formality to signify the end of its operating day (in the United States, the broadcast logging day ends at 12:00 midnight local time).

  5. Year 2038 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2038_problem

    Many computer systems measure time and date using Unix time, an international standard for digital timekeeping.Unix time is defined as the number of seconds elapsed since 00:00:00 UTC on 1 January 1970 (an arbitrarily chosen time based on the creation of the first Unix system), which has been dubbed the Unix epoch.

  6. Why daylight saving time is unhealthy – a neurologist explains

    www.aol.com/news/why-daylight-saving-time...

    Changing clocks twice a year may be more than just a biannual annoyance. Carol Yepes/Moment via Getty ImagesAs people in the U.S. prepare to turn their clocks ahead one hour in mid-March, I find ...

  7. Time clock - Wikipedia

    en.wikipedia.org/wiki/Time_clock

    Electronic time clock. A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card

  8. Is this year the last year we’ll have to adjust our clocks ...

    www.aol.com/news/last-ll-adjust-clocks-daylight...

    If you’ve grumbled about the disruption in your sleep when having to change your clock twice a year for Daylight Saving Time, you are not alone. ... You can get TurboTax for 30% off on Amazon ...

  9. Mengenlehreuhr - Wikipedia

    en.wikipedia.org/wiki/Mengenlehreuhr

    The Mengenlehreuhr clock face utilizes 24 light switches (1+4+4+11+4=24) to display time in 0-24 hour, 0-59 minute and even/odd second. Second: The top big circular light is the second mark. Since 0 is represented as an OFF in the most logical circuit, It’s an even second when the light is OFF. When the second light is ON, it’s on an odd ...