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  2. Digital clock - Wikipedia

    en.wikipedia.org/wiki/Digital_clock

    A digital clock's display changing numbers. To represent time, most digital clocks use a seven-segment LED, VFD, or LCD for each of the four digits. They generally also include other elements to indicate whether the time is AM or PM, whether or not an alarm is set, and so on. Older digital clocks used numbers painted on wheels, or a split-flap ...

  3. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    The heart of NIST's next-generation miniature atomic clock – ticking at high "optical" frequencies – is this vapor cell on a chip, shown next to a coffee bean for scale. In addition to increased accuracy, the development of chip-scale atomic clocks has expanded the number of places atomic clocks can be used.

  4. Radio clock - Wikipedia

    en.wikipedia.org/wiki/Radio_clock

    A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.

  5. List of atomic clocks - Wikipedia

    en.wikipedia.org/wiki/List_of_atomic_clocks

    This is a list of some experimental laboratory atomic clocks worldwide. This list is incomplete; you can help by adding missing items. ... Hong Kong China [20]

  6. Time signal - Wikipedia

    en.wikipedia.org/wiki/Time_signal

    There are many commercially available radio controlled clocks available to accurately indicate the local time, both for business and residential use. Computers often set their time from an Internet atomic clock source. Where this is not available, a locally connected GNSS receiver can precisely set the time using one of several software ...

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  8. Nuclear clock - Wikipedia

    en.wikipedia.org/wiki/Nuclear_clock

    For a trap-based nuclear clock either a single 229 Th 3+ ion is trapped in a Paul trap, known as the single-ion nuclear clock, [1] [2] or a chain of multiple ions is trapped, considered as the multiple-ion nuclear clock. [7] Such clocks are expected to achieve the highest time accuracy, as the ions are to a large extent isolated from their ...

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