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character: Ptolemy
topic: Ancient Greek Astronomy
grade: 4
subject: History
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character: Hipparchus
topic: Astronomical Discoveries
grade: 4
subject: History
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character: Aristotle
topic: Geocentric Model of the Universe
grade: 4
subject: History
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character: Claudius Ptolemy
topic: Geography and Mapping
grade: 4
subject: History
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