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A clock is a device used to measure and indicate the passage of time. Different types of clocks include analog clocks, digital clocks, sundials, and atomic clocks. A watch is a type if clock that is usually worn at the wrist. An Alarm clock is a special clock that is designed to wake people up in the morning. <br />

A '''clock''' is a device used to measure and indicate the passage of time. Different types of clocks include analog clocks, digital clocks, sundials, and atomic clocks. A watch is a type if clock that is usually worn at the wrist. An Alarm clock is a special clock that is designed to wake people up in the morning. <br />

Note that most clocks commonly called atomic clocks are technically little more than digital clocks.  However, they are updated periodically by [[radio]] transmissions based on the time determined by a central atomic clock.

Note that most clocks commonly called atomic clocks are technically little more than digital clocks.  However, they are updated periodically by [[radio]] transmissions based on the time determined by a central atomic clock.

==See also==

==See also==

*[[time]]

*[[time]]