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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. 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

  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. 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.

  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 ...