Claudius "Ptolemy" Ptolemaeus was an Egyptian-born but Greco-Roman astronomer, one of the notable historical astronomers.
Solar System concept
Ptolemy proposed to Solar System's structure to have Earth at the center, with the following astronomical bodies orbiting it in terms of increasing distance:
- Moon, Mercury, Venus, Sun, Mars, Jupiter, Saturn, Sirius, Stars.
His concept was later corrected by Nicolaus Copernicus, a Polish mathematician, who suggested that the Earth was a planet and the Sun was at the center of our Solar System.