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Britannica.com - Clockworks: From Sundials to the Atomic Second

  Link Details for: Britannica.com - Clockworks: From Sundials to the Atomic Second
Link Title: Britannica.com - Clockworks: From Sundials to the Atomic Second Open in a new window
Link URL: http://www.britannica.com/clockworks
Link Details: Britannica.com explores the history of timekeeping, from sundials to cesium atomic clocks.
Category: Top : Science : Astronomy : Calendars_and_Timekeeping
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Britannica.com - Clockworks: From Sundials to the Atomic Second