character: Nicolaus Copernicus
topic: Heliocentric Theory Challenge to Geocentrism
grade: 9
subject: Mathematics
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character: Galileo Galilei
topic: Support of Heliocentric Theory
grade: 9
subject: Mathematics
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character: Johannes Kepler
topic: Planetary Motion and Heliocentric Model
grade: 9
subject: Mathematics
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character: Ptolemy
topic: Geocentric Theory Overview
grade: 9
subject: Mathematics
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