- House of Ptolemy
 - Concentrates on the Ptolemies and their world, from 331-30 BCE. - Claudius Ptolemy
- Extensive information on what we know about the geocentric astronomer. Also contains other astronomer links.
- Ptolemy, the Man
- Astronomer, mathematician and geographer.
- Ptolemaic System
- Ptolemy presented a complete system of mathematical constructions that accounted successfully for the observed motion of each heavenly body.
- Ptolemy of Alexandria
- Ancient astronomer, geographer, and mathematician who considered the Earth the centre of the universe.
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