Question

2. How do the ancient Greek model and Ptolemy's model differ?

Answer 1

The ancient Greek model was a simple geocentric view, while Ptolemy's model was an advanced geocentric view using complex circles called epicycles. Ptolemy's model predicted planetary positions without a unified cause, in contrast to the later heliocentric model introduced by Copernicus.

Step-by-step explanation:

Differences between Ancient Greek and Ptolemy's Models

The ancient Greek model of the universe was geocentric, which means that it placed the Earth at the center of the universe. This concept was profoundly expanded upon by the Greek philosopher Ptolemy in the second century AD, who developed the Ptolemaic model. This model also positioned the Earth at the center but was characterized by a complex system of dozens of circular paths called epicycles to explain the motions of planets. Despite its complexity, it lacked a unified theory of cause and effect, making it purely descriptive with each celestial body having its own set of rules.

The Ptolemaic model endured for over a thousand years until the emergence of the Copernican model which placed the Sun at the center of the solar system. The Copernican model was simpler, more accurate, and grounded in physical laws, including Newton's universal law of gravitation. While Ptolemy's system was more about predicting planetary positions, the Copernican revolution introduced a heliocentric model backed by scientific explanations.

Answer 2

Greek's Model used stars while Ptolemy did not use stars.

Step-by-step explanation:

The Greek model had stars as part of the system and they revolved around the Earth. Ptolemy's model did not include the stars, but it did include the moons that revolves around the planets.