100 - 170


Claudius Ptolemy (; Koinē Greek: Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos [kláwdios ptolɛmɛ́os]; Latin: Claudius Ptolemaeus; c. 100 – c. 170) was a Greek mathematician, astronomer, geographer and astrologer. He lived in the city of Alexandria in the Roman province of Egypt under the rule of the Roman Empire, had a Latin name (which several historians have taken to imply he was also a Roman citizen), cited Greek philosophers, and used Babylonian observations and Babylonian lunar theory. The 14th century astronomer Theodore Meliteniotes gave his birthplace as the prominent Greek city Ptolemais Hermiou (Πτολεμαΐς ‘Ερμείου) in the Thebaid (Θηβᾱΐς). Read more on Wikipedia

Since 2007, the English Wikipedia page of Ptolemy has received more than 3,332,890 page views. His biography is available in 107 different languages on Wikipedia making him the 5th most popular astronomer.

Memorability Metrics

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    Historical Popularity Index (HPI)

  • 107

    Languages Editions (L)

  • 11.97

    Effective Languages (L*)

  • 4.28

    Coefficient of Variation (CV)

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Among astronomers, Ptolemy ranks 5 out of 495Before him are Galileo Galilei, Nicolaus Copernicus, Johannes Kepler, and Giordano Bruno. After him are Tycho Brahe, Anders Celsius, Aristarchus of Samos, Edwin Hubble, Ulugh Beg, Hipparchus, and Ole Rømer.

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Among people born in 100, Ptolemy ranks 1After him are Pope Alexander I, Joseph of Arimathea, Longinus, James the Less, Decebalus, Pope Telesphorus, Pope Victor I, Pope Hyginus, Dionysius the Areopagite, Saint Sarah, and Justin Martyr. Among people deceased in 170, Ptolemy ranks 1After him are Apuleius, Salvius Julianus, and Junius Rusticus.

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In Egypt

Among people born in Egypt, Ptolemy ranks 7 out of 432Before him are Moses (-1393), Tutankhamun (-1341), Cleopatra (-69), Euclid (-350), Nefertiti (-1400), and Akhenaten (-1400). After him are Hypatia (350), Yasser Arafat (1929), Amenhotep III (-1403), Origen (185), Hatshepsut (-1507), and Joshua (-1355).


Among astronomers born in Egypt, Ptolemy ranks 1After him are Sosigenes of Alexandria (-80) and Timocharis (-320).

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