Copernicus initiated a major shift in astronomy by developing a heliocentric model, where the Sun is at the center of the solar system, rather than the Earth. This was a significant change from the geocentric models of Ptolemy and Aristotle, which placed the Earth at the center. Therefore, the correct answer is: he developed a heliocentric model, where the sun was at the center of the solar system.
Copernicus started astronomy on its modern path by making what major change to the models of Ptolemy and Aristotle? he found that the planets velocities were not constant as they orbited; he discovered the many moons of planets, such as Jupiter and Saturn; he developed a heliocentric model, where the sun was at the center of the solar system; or he found that the orbits of planets were not perfectly circular.
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