Sosigenes of Alexandria

80 BC - 100 BC

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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 definition of the Julian calendar. Read more on Wikipedia

Since 2007, the English Wikipedia page of Sosigenes of Alexandria has received more than 93,456 page views. His biography is available in 34 different languages on Wikipedia (up from 32 in 2019). Sosigenes of Alexandria is the 71st most popular astronomer (down from 49th in 2019), the 160th most popular biography from Egypt (down from 131st in 2019) and the 2nd most popular Egyptian Astronomer.

Sosigenes of Alexandria is most famous for the discovery of the precession of the equinoxes.

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  • 34

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  • 7.68

    Effective Languages (L*)

  • 2.58

    Coefficient of Variation (CV)

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Among astronomers, Sosigenes of Alexandria ranks 71 out of 532Before him are Pierre Janssen, Pieter van Musschenbroek, Stephen Gray, John Flamsteed, George Darwin, and Petrus Plancius. After him are Johann Franz Encke, Jacques Cassini, Lewis A. Swift, Ejnar Hertzsprung, Walter Baade, and Abū Ishāq Ibrāhīm al-Zarqālī.

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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 6Before him are Lentulus Batiatus, Gaius Claudius Glaber, Wang Zhaojun, Gnaeus Pompeius Trogus, and Publilius Syrus. After him are Timaeus of Locri, Antipater of Sidon, Lucius Appuleius Saturninus, Artemidorus Ephesius, Apollonius Molon, and Bocchus I.

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In Egypt

Among people born in Egypt, Sosigenes of Alexandria ranks 160 out of 520Before him are Berenice III of Egypt (-120), Hemiunu (-2500), Nectanebo II (-400), Al-Mansur Qalawun (1222), Ptolemy VIII Physcon (-182), and Huda Sha'arawi (1879). After him are Saadia Gaon (882), Cleopatra V of Egypt (-100), Dodi Fayed (1955), Zahi Hawass (1947), Merit-Ptah (-2700), and Taha Hussein (1889).


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