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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 processes have been used over the millennia.
- History of timekeeping devices
The Shortt–Synchronome clock, an electrical driven pendulum...
- List of clocks
This is a list of clocks that have attained notability...
- 12-hour clock
The 12-hour clock is a time convention in which the 24 hours...
- History of timekeeping devices
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.
An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on atoms having different energy levels. Electron states in an atom are associated with different energy levels, and in transitions between such states they interact with a very specific frequency of electromagnetic radiation.
Eine Echtzeituhr (englisch real-time clock, RTC) oder physikalische Uhr ist eine Uhr, welche die physikalische Zeit misst. Im Gegensatz dazu misst eine logische Uhr eine relative Zeit, die nicht der aktuellen Uhrzeit entspricht.
