character: John Harrison
topic: Development of the Marine Chronometer
grade: 10
subject: Geography
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character: Longitude Prize
topic: Impact on navigation and marine exploration
grade: 10
subject: Geography
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character: Captain James Cook
topic: Use of chronometers in mapping the Pacific
grade: 10
subject: Geography
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character: Royal Observatory, Greenwich
topic: Influence on timekeeping standards for navigation
grade: 10
subject: Geography
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