H1
John Harrison’s ‘marine chronometer’ is one of the most important inventions in human history. It revolutionised navigation, trade and exploration in the eighteenth century and helped the rise of imperialism in the nineteenth century.
In order to find your way accurately, you need to know first where you are and second where you want to be. In pre-industrial societies that might mean a simple case of knowing you are in this town, and want to be in the next town, and that a particular road will take you there.
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