1. Ptolemy - Noun
2. Ptolemy - Proper noun
Alexandrian astronomer (of the 2nd century) who proposed a geocentric system of astronomy that was undisputed until the late Renaissance
an ancient dynasty of Macedonian kings who ruled Egypt from 323 BC to 30 BC; founded by Ptolemy I and ended with Cleopatra
Source: WordNetAccording to Ptolemy, Hipparchus measured the longitude of Spica and Regulus and other bright stars. Source: Internet
A C15th copy of Ptolemy's map of Britain Ptolemy also devised and provided instructions on how to create maps both of the whole inhabited world ( oikoumenè ) and of the Roman provinces. Source: Internet
A copy of Ptolemy 's Almagest was brought back to Sicily by Henry Aristippus (d. 1162), as a gift from the Emperor to King William I (r. 1154 1166). Source: Internet
Across Europe, the Middle East and North Africa in the Medieval period, it was the authoritative text on astronomy, with its author becoming an almost mythical figure, called Ptolemy, King of Alexandria. Source: Internet
All rulers of the Ptolemaic dynasty uninterruptedly from Ptolemy IV ( Ptolemy II married his sister but had no issue) were married to their brothers and sisters, so as to keep the Ptolemaic blood "pure" and to strengthen the line of succession. Source: Internet
Alhazen corrected a significant error of Ptolemy regarding binocular vision, but otherwise his account is very similar; Ptolemy also attempted to explain what is now called Hering's law. Source: Internet