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For song by Coldplay, see Clocks (song). 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.
- History of timekeeping devices
Contents. hide. (Top) Continuous timekeeping devices. Shadow...
- List of clocks
This is a list of clocks that have attained notability...
- 24-hour clock
The modern 24-hour clock is the convention of timekeeping in...
- History of timekeeping devices
Relógio de pulso. O relógio é um dispositivo acionado por mola, eletricidade ou outros materiais [ 1] utilizado como medidor do tempo desde a Antiguidade, em variados formatos. É uma das mais antigas invenções humanas. Relojoaria é tanto o termo que designa o seu fabricante, como a loja onde são vendidos.
Atomic clocks have the benefit that atoms are universal, which means that the oscillation frequency is also universal. This is different from quartz and mechanical time measurement devices that do not have a universal frequency. A clock's quality can be specified by two parameters: accuracy and stability.
A clock is a device that tells the time. Some clocks can only show the time. Other clocks can show other things. For example, some clocks can show the date as well as the time, or show other information, like the timer temperature or the weather, some have stopwatch and some have alarm.
