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On Time: The Quest for Precision: Time: History & Measurement

Historical Timepieces

Engraving of the Aztec calendar stone from Descripción histórica y cronológica de las dos piedras. ("Historical and Chronological Description of Two Stones..."; 1792)

Reconstruction of a water clock built by Ctesibius of Alexandria, 3rd century BC; on display at the Thessaloniki Technology Museum

John Harrison's H3 marine chronometer (without its case) displayed at the National Maritime Museum, Greenwich, London

The first solar powered watch, the Synchronar 2100 (SYNchronous CHRONometer calendAR); invented by Roger W. Riehl in 1972

History of Time