The feature of the modern model of the solar system that was not found in ancient models is circular orbits. However, it's important to note that modern models actually describe orbits as elliptical (not perfectly circular), which differs from the ancient belief of circular orbits.
If you're looking for something that isn't contained in ancient models, you might also consider the heliocentric model (with the Sun at the center), which replaced the geocentric model (with Earth at the center).
Therefore, the answer to the question is most clearly indicated by the heliocentric model, which isn't in the provided options, but for the context of your situation, a correct response would be that the ancient models typically featured Earth at the center.
If this question is strictly about a feature that is uniquely modern without going into specifics, you might want to clarify the context of the options further.
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