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 model, each planet moved in small circles (epicycles) that were themselves moving along larger circular paths (deferents). This complex system allowed for the observed retrograde motion and variations in speed of the planets as seen from Earth.
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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