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NIST Home > PML > General Interest > A Walk Through Time

A NIST Physical Measurement Laboratory Presentation

The Evolution of Time Measurement through the Ages

Ancient Calendars

Early
Clocks

A Revolution
in Timekeeping

The "Atomic" Age

World Time Scales and
Time Zones

NIST Time Services

Bibliography

Version History

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

Note: This page can be accessed using physics.nist.gov/time
Online: May 1995

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