100 - 170


Claudius Ptolemy (; Koinē Greek: Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos [kláwdios ptolɛmɛ́os]; Latin: Claudius Ptolemaeus; c. 100 – c. 170) was a mathematician, astronomer, geographer and astrologer who wrote several scientific treatises, three of which were of importance to later Byzantine, Islamic and Western European science. The first is the astronomical treatise now known as the Almagest, although it was originally entitled the Mathematical Treatise (Μαθηματικὴ Σύνταξις) and then known as The Great Treatise (Ἡ Μεγάλη Σύνταξις). The second is the Geography, which is a thorough discussion of the geographic knowledge of the Greco-Roman world. Read more on Wikipedia

Since 2007, the English Wikipedia page of Ptolemy has received more than 3,420,963 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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