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spacer A Walk through Time
History of timekeeping from ancient to modern times.
(at NIST)
  
spacer Calendars through the Ages
Systems of counting the days, months, and years.
(at webexhibits.org)
  
spacer Daylight Saving Time
When and why do we change our clocks?
(at webexhibits.org)
  
spacer ClockWorks
Illustrated mechanisms of many historical clocks.
(at Britannica)
  
spacer It's About Time
Advances in timekeeping accuracy and atomic clocks.
(at University of Wisconsin)
  
spacer The Quartz Watch
What's inside your wristwatch? See stories and timeline.
(at Smithsonian)

Disclaimer Note: Linking to these sites does not imply recommendation or
endorsement of the information or commercial products by NIST or USNO.
  

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