Question

Scientific theories and models change over time. In the second century, Ptolemy, who lived in the Egyptian town of Alexandria, produced a mathematical representation based on observation of the known solar system. Ptolemy’s model is called geocentric because the Earth was at the centre with the Sun and planets revolving in a series of circular orbits around the Earth. Copernicus reconstructed Ptolemy’s model 1200 years later, producing the heliocentric model, with the planets orbiting the Sun. This model differs from models we see today thanks to the discoveries of other astronomers. How has the heliocentric model been amended?

Answer 1

In the second century, Ptolemy, who lived in the Egyptian town of Alexandria, produced a mathematical representation based on observation of the known solar system. ... Copernicus reconstructed Ptolemy's model 1200 years later, producing the heliocentric model, with the planets orbiting the Sun.

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