Ptolemy's model of the solar system explained the apparent changes in speed and direction of the planets by proposing that the planets spun on epicycles. In this geocentric model, planets moved in small circles (epicycles) along larger circles (deferents) around the Earth, which accounted for their observed retrograde motion and varying speeds.
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 spun on epicycles.
The planets spun on epicycles.
The planets were attached to crystalline surfaces.
The planets were attached to crystalline surfaces.
The planets had a significant stellar parallax.
1 answer