Final answer:
Copernicus proposed the sun-centered model with Earth as one of the revolving planets, challenging Ptolemy's geocentric system.
Explanation:
Nicolaus Copernicus was the first to suggest a sun-centered system where the Earth is one of the planets revolving around the sun, challenging the geocentric model proposed by Ptolemy. Copernicus' heliocentric theory laid the groundwork for advancements by scientists like Galileo, Kepler, and Newton in understanding celestial motions.
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