spaceholder A Walk Through Time logo spaceholder
A NIST Physics Laboratory Presentation
The Evolution of Time Measurement through the Ages
 

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Ancient Calendars
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Early Clocks
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A Revolution in Timekeeping
cesium clock thumbnail
The "Atomic" Age
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World Time Scales and Time Zones
International Space Station satellite thumbnail
NIST Time Services
Bibliography (stack of books thumbnail)
Bibliography

Version History

National Institute of Standards and Technology (NIST)
Physics Laboratory
Time and Frequency Division (for additional information on time services and standards)

Go to NIST Time and Frequency exhibits

Note: This page can be accessed using http://physics.nist.gov/time

Online: May 1995 - Last update: April 30, 2002 - cns