Articles About Clocks (4)
![Illustration image](http://c.tadst.com/gfx/150x84/atom-clocks-ptb.jpg?1)
How Does an Atomic Clock Work?
Atomic clocks are among the most accurate timekeepers in human history. Just how precise are they and how do they work?
![Illustration image](http://c.tadst.com/gfx/150x84/noon-clock.jpg?1)
AM and PM Explained
How does the 12-hour clock system work? Is midnight 12 am or 12 pm?
![Illustration image](http://c.tadst.com/gfx/150x84/leapseconds.jpg?1)
What Are Leap Seconds?
Every now and then a leap second is added to Coordinated Universal Time (UTC) in order to synchronize clocks worldwide with the Earth's rotation.
![A C17 Globemaster military cargo plane takes off from a dusty airstrip, with rugged mountains in the background.](http://c.tadst.com/gfx/150x84/globemaster-takeoff.jpg?1)
Military Time: The 24-Hour Clock
Military Time uses a 24-hour time format and the NATO alphabet. How does it work? Conversion chart: What is 1500 Zulu Time in 12-hour AM/PM format?