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

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

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