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. This model included the concept of small circular orbits (epicycles) on larger circular ones (deferents), which helped account for the retrograde motion of planets and their varying speeds as viewed 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 had a significant stellar parallax.
The planets had a significant stellar parallax.
The planets spun on epicycles.
The planets spun on epicycles.
The planets were fixed to nested spheres.
The planets were fixed to nested spheres.
The planets were attached to crystalline surfaces.
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