Which of the following is NOT included in Ptolemy\'s model of the solar system?

Question

Which of the following is NOT included in Ptolemy's model of the solar system?

a. epicycles

b. eccentrics

c. eccentric epicycles

d. nested spheres

Eventually philosophers decided that the lowest point in the Cosmos was the center of the Cosmos and that everything was attracted to that point. But, denser objects push lighter ones out of the way. What phenomenon did this NOT explain?

a. The Earth is a sphere.

b. The Earth and the things on it are layered.

c. There are volcanoes some places on Earth but not in others.

d. The oceans sit on the Earth without falling over the edge.

Explanation / Answer

The concept of nested spheres was introduced by the Greek philosopher Aristotle, who predicted that the heaven is composed of 55 layers of concentric crystalline solid spheres. Planets, according to him were embedded into these spheres. This concept of nested sphere was taken up by Ptolemy and was included in his model to construct a more evolved model for the universe. He implemented that the planets are moving in a "circular" path, called the epicycle, which further revolves around a point in a circular path. So the concept of eccentric epicycles was not included in the model.

The oceans sit on the Earth without falling over the edge is the correct answer. If all the heavy density objects are pushing lighter objects away then the Earth itself would have thrown away the oceans out of its reach.

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