Sosigenes of Alexandria

80 BC - 100 BC

Sosigenes of Alexandria

Sosigenes of Alexandria (Greek: Σωσιγένης ὁ Ἀλεξανδρεύς) was a Greek astronomer from Ptolemaic Egypt who, according to Roman historian Pliny the Elder, was consulted by Julius Caesar for the design of the Julian calendar.Little is known about him apart from Pliny's Natural History. Sosigenes appears in Book 18, 210-212: "... There were three main schools, the Chaldaean, the Egyptian, and the Greek; and to these a fourth was added in our country by Caesar during his dictatorship, who with the assistance of the learned astronomer Sosigenes (Sosigene perito scientiae eius adhibito) brought the separate years back into conformity with the course of the sun."In Book 2, chapter 6, Sosigenes is credited with work on the orbit of Mercury: "The star next to Venus is Mercury, by some called Apollo; it has a similar orbit, but is by no means similar in magnitude or power. Read more on Wikipedia

Since 2007, the English Wikipedia page of Sosigenes of Alexandria has received more than 73,282 page views. His biography is available in 32 different languages on Wikipedia making him the 48th most popular astronomer.

Memorability Metrics

  • 73k

    Page Views (PV)

  • 62.87

    Historical Popularity Index (HPI)

  • 32

    Languages Editions (L)

  • 9.90

    Effective Languages (L*)

  • 2.12

    Coefficient of Variation (CV)

Page views of Sosigenes of Alexandrias by language


Among astronomers, Sosigenes of Alexandria ranks 49 out of 495Before him are Johann Palisa, William Alfred Fowler, Asaph Hall, Antony Hewish, Jérôme Lalande, and Caroline Herschel. After him are Ahmad ibn Muhammad ibn Kathir al-Farghani, Friedrich Georg Wilhelm von Struve, Pierre Janssen, Pierre Méchain, William Lassell, and Gerard Kuiper.

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Among people born in 80 BC, Sosigenes of Alexandria ranks 4Before him are Vercingetorix, Valmiki, and Aenesidemus. After him are Gnaeus Pompeius and Gnaeus Domitius Ahenobarbus. Among people deceased in 100 BC, Sosigenes of Alexandria ranks 4Before him are Lentulus Batiatus, Gnaeus Pompeius Trogus, and Wang Zhaojun. After him are Publilius Syrus, Gaius Claudius Glaber, Timaeus of Locri, Antipater of Sidon, Apollonius Molon, Artemidorus Ephesius, Bocchus I, and Lucius Appuleius Saturninus.

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In Egypt

Among people born in Egypt, Sosigenes of Alexandria ranks 131 out of 432Before him are Cleopatra IV of Egypt (-138), Kiya (-1400), Ibn Hajar al-‘Asqalani (1372), Claude François (1939), Mentuhotep III (-2050), and Ahmose-Nefertari (-1562). After him are Ayman al-Zawahiri (1951), Smendes (-1200), Hemiunu (-2500), Neferirkare Kakai (-2483), Senusret II (-1900), and Psusennes I (-1100).


Among astronomers born in Egypt, Sosigenes of Alexandria ranks 2Before him are Ptolemy (100). After him are Timocharis (-320).

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