This Ptolemaic system presented tables of information allowing convenient predictions of planetary locations. Ptolemy also catalogued 48 constellations, the names of which are still in use at present.

In the ‘Ptolemaic system’, the planets, the sun and the moon each occupied a separate rotating sphere around the Earth. In Europe and many parts of Asia, this was assumed correct for 1,400 years.

The old Ptolemaic system in which the planets orbit the Earth in cycles and epicyles was actually a valid approach. We say that the orbits are elliptical, but an ellipse is an epicycle; ...

Archaeologists uncovered ancient military fortifications from Ptolemaic and Roman eras in Egypt's Tell Abu Sefeh, revealing strategic defenses that protected Egypt's eastern frontier.