Sun-centered model, a theory that the Sun is at the center of the Universe, orbitt, a complete revolution around a body in space, like a star or a planet, Earth-centered model, a theory that all planets, stars and moons revolve around Earth, orbital period, the time it takes to complete one full revolution around a body in space, kepler , was a German astronomer who worked as Brahe’s assistant at the turn of the 17th century..

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