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 attached to crystalline surfaces.
The planets were attached to crystalline surfaces.
The planets spun on epicycles.
The planets spun on epicycles.
The planets had a significant stellar parallax.
The planets had a significant stellar parallax.
The planets were fixed to nested spheres.
The planets were fixed to nested spheres.
The correct answer is: The planets spun on epicycles.
Ptolemy's model of the solar system explained the apparent changes in speed and direction of the planets by proposing that each planet moved on a small circle called an epicycle, while the center of the epicycle moved on a larger circle called a deferent. This combination of motions allowed for the observed changes in speed and direction of the planets as seen from Earth.