character: Galileo Galilei
topic: Support for Heliocentric Theory through Observations
grade: 9
subject: Mathematics
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character: Copernicus
topic: Heliocentric Model Development
grade: 9
subject: Mathematics
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character: Kepler
topic: Laws of Planetary Motion
grade: 9
subject: Mathematics
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character: Ptolemy
topic: Geocentric Model and its Limitations
grade: 9
subject: Mathematics
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