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A Walk Through Time
looks at the evolution of timekeeping—how humans have measured the passage of time throughout history. The site describes and shows depictions of ancient calendars, sun and water... (National Institute of Standards and Technology) |
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Calendars Through the Ages
looks at the astronomical basis of calendars, the history of our (Gregorian) calendar, and when various countries moved from the Julian to the Gregorian calendar. Learn about Leap... (National Institute of Standards and Technology) |
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National Institute of Standards and Technology (NIST) Virtual Museum
features the work of a federal agency that has helped keep U.S. technology at the leading edge. Visit the online exhibits to learn about the standardization of women's clothing... (National Institute of Standards and Technology) |
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NIST Time and Frequency Information
provides information, tools, and services for timekeeping and frequency measurement. Visitors can download time-setting software for their computer, read about how time is... (National Institute of Standards and Technology) |
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