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Astronomy: Calendars and Timekeeping: Britannica.com - Clockworks: From Sundials to the Atomic Second
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Submitted: Sat Sep 06 2003
Title: Britannica.com - Clockworks: From Sundials to the Atomic Second
URL: http://www.britannica.com/clockworks
CT: Astronomy: Calendars and Timekeeping: Britannica.com - Clockworks: From Sundials to the Atomic Second

 

Description: Britannica.com explores the history of timekeeping, from sundials to cesium atomic clocks.
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