3.5 Timing
"From descriptive laws there is a subtle progress (whose chief agents are Galileo and Kepler) to the idea of a deeper law, namely a mechanism which drives the phenomena like a ainstpring.  Anad then here is a second progression to the modern idea that the phenomena are guided by the geometry of space-and-time itself".
J Bronowski
graphic
John Harrison's first marine timekeeper
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