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character: Aristotle
topic: Ancient Observations of Earth
grade: 9
subject: Mathematics
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character: Eratosthenes
topic: Calculating the Earth's Circumference
grade: 9
subject: Mathematics
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character: Ptolemy
topic: Geocentric Model of the Universe
grade: 9
subject: Mathematics
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character: Hipparchus
topic: Star Catalog and Earth Measurement Techniques
grade: 9
subject: Mathematics
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