The biggest difference between the geocentric and heliocentric models of our solar system is as follows:
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Geocentric Model: Earth is at the center of our solar system, and all celestial bodies, including the Sun, revolve around it.
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Heliocentric Model: The Sun is at the center of our solar system, and the Earth, along with other planets, revolves around the Sun.
So, the correct statement is: "In the geocentric model, Earth is at the center of our solar system. In a heliocentric model, the Sun is at the center of the solar system."