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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 clocks, mechanical and quartz clocks, and world time scales and time zones. (National Institute of Standards and Technology)

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Interesting Fact:

April 1 has long been an opportunity for children to tease their teachers.
Artist's drawing of Stonehenge

Ancient calendars

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