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character: Ptolemy
topic: Geographic Coordinates
grade: 12
subject: Geography
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character: Eratosthenes
topic: Early Measurement of Earth's Circumference
grade: 12
subject: Geography
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character: Hipparchus
topic: Development of Celestial Coordinates
grade: 12
subject: Geography
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character: Mercator
topic: Projection and Mapping Techniques
grade: 12
subject: Geography
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