Ptolemy's model of the solar system explained the apparent changes in speed and direction of the planets by stating that the planets spun on epicycles. In this geocentric model, each planet moved in small circles (epicycles) that were themselves moving along larger circles (deferents) around the Earth, which accounted for the observed retrograde motion and varying speeds of the planets.
How did Ptolemy's model of the solar system explain the apparent changes in speed and direction of the planets?(1 point) Responses The planets were fixed to nested spheres. The planets were fixed to nested spheres. The planets were attached to crystalline surfaces. The planets were attached to crystalline surfaces. The planets had a significant stellar parallax. The planets had a significant stellar parallax. The planets spun on epicycles.
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