Clocks know the time because they get instructions from something else. Like how your phone knows when to show you a message, it gets a signal from the internet. Clocks can also use signals from radio stations or satellites, which tell them exactly what time it is.
Examples
- A kitchen clock updates itself every night when it hears a radio signal.
- Your phone knows the time because it gets a message from GPS satellites.
- The school bell rings on time thanks to a clock that listens to a special radio signal.
See also
- How Did the Internet Begin?
- What Is the Purpose of a Clock Tower?
- How Does a Smartphone Recognize Your Face?
- Why Do We Use Passwords for Security?
- Why Do We Get 'The Runs' on Planes?
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