What Time Is It?
ES0405  All About Time

  !   Explore the links to the right to find out more about time.

NIST
The Cesium Fountain Atomic Clock at the National Institute of Standards and Technology in Boulder, Colorado.

On our rotating planet, the sun appears to rise, travel across the sky, and set each day. Every moment on Earth, the sun is rising somewhere, and setting somewhere else. Indeed, every one of the twenty-four hours of a day is happening in some time zone right now. Ultimately, the question "What time is it?" depends on where you are.

Current time in the U.S.

A history of measuring time

Time and longitude

More links about time


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