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Nature 424, 879-880 (21 August 2003) | doi:10.1038/424879a

Finding the time

Jeremy Gray1

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The scientific struggle to bring the world's clocks into line.

BOOK REVIEWEDEinstein's Clocks and Poincaré's Maps: Empires of Time

by Peter Galison


W. W. Norton: 2003. 370 pp. $23.95
Sceptre: 2003. £14.99

The challenge of synchronizing clocks around the world, and accurately determining longitudes, required the construction of a great net of cables, often with considerable difficulty. With similar energy, scientists and politicians fought to establish the zero meridian and even the units of time (the French lost both contests, so Greenwich is the zero meridian and time was not decimalized).