How Thales Was Able to Predict the Solar Eclipse of 28 May 585 B.C.

  • Dirk L. Couprie
Part of the Astrophysics and Space Science Library book series (ASSL, volume 374)


In the year 467 B.C. at Aegospotamoi, a stone fell from the heaven. It is said that Anaxagoras, thanks to his knowledge of astronomy, was able to predict the fall of this famous meteorite (DK 59A1(10), DK 59A6, DK 59A10, and DK 59A11; also in Ammianus Marcellinus’ History of Rome 22.8.5, not in DK, but see remark on p. 9, line 12). Nobody, however, has ever been concerned to find out the method he could have used to predict this event. Taking for granted that it is impossible to predict the fall of a meteorite, the attribution of that prediction to Anaxagoras has been dismissed as an instance of the habit of crediting the Presocratics with all kinds of discoveries. In his Life of Dion, Plutarch reports that during Plato’s visit to Sicily, Helicon of Cyzicus predicted a solar eclipse. When his prediction came true, he was admired and rewarded by the tyrant (Life of Dion 19, see also Life of Lysander 12). Nobody has ever tried to determine the method Helicon might have used to accomplish such a remarkable achievement. Many scholars have, by contrast, tried to reconstruct the method that Thales might have used in predicting a solar eclipse, with which he is credited by ancient authors.1 The story is told by Herodotus: in the 6th year of the war between the Lydian king Alyattes and the Medes under Cyaxares, during a battle, all of a sudden the day became night (Histories I 74 = DK 11A5). The reports of other authors depend on his account (see DK 11A1, DK 11A2, and DK 11A5). The eclipse of 28 May 585 B.C., which was almost total at Miletus, is generally accepted as the one predicted by Thales. This date also matches best Pliny’s testimony that the eclipse took place in the 170th year after the foundation of Rome, 753 B.C. (Naturalis historia II, 53 = DK 11A5; see also Stephenson and Fatoohi 1997: 280).


Solar Eclipse Full Moon Fellow Citizen Lunar Eclipse Total Eclipse 
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  1. Aaboe, Asger. 1972. Remarks on the Theoretical Treatment of Eclipses in Antiquity. Journal for the History of Astronomy 3: 105–118.ADSMathSciNetGoogle Scholar
  2. Aveni, Anthony F. 1993. Ancient Astronomers. Washington, DC: Smithsonian Books.Google Scholar
  3. Britton, John P. 1989. An Early Function for Eclipse Magnitudes in Babylonian Astronomy. Centaurus 32: 1–52.CrossRefzbMATHADSMathSciNetGoogle Scholar
  4. Burch, George B. 1949–1950. Anaximander, the First Metaphysician. Review of Metaphysics 3: 137–160.Google Scholar
  5. Couprie, Dirk L. 2004b. How Thales Was Able to “Predict” a Solar Eclipse Without the Help of Alleged Wisdom. Early Science and Medicine 9: 321–337.CrossRefMathSciNetGoogle Scholar
  6. Diels, Hermann. 1876. Chronologische Untersuchungen über Apollodors Chronica. Rheinisches Museum 31: 1–54.Google Scholar
  7. Ekschmitt, Werner. 1969. Weltmodelle. Griechische Weltbilder von Thales bis Ptolemäus. Mainz am Rhein: Verlag Philipp von Zabern.Google Scholar
  8. Fehling, Detlev. 1985a. Die sieben Weisen und die frühgriechische Chronologie . Bern: Peter Lang.Google Scholar
  9. Hartner, Willy. 1969. Eclipse Periods and Thales’ Prediction of a Solar Eclipse. Centaurus 14: 60–71.CrossRefzbMATHADSMathSciNetGoogle Scholar
  10. Haslam Michael W., ed. and transl., 1986. The Oxyrhynchus Papyri, Vol. 53. London: The British Academy.Google Scholar
  11. Herrmann, Joachim. 1969. Gesetze des Weltalls. Stuttgart: Kosmos. Gesellschaft der Naturfreunde Franck’sche Verlagshandlung.Google Scholar
  12. Kudlek, Manfred and Erich H. Mickler. 1971. Solar and Lunar Eclipses of the Ancient near East from 3000 B.C. to 0 with Maps. Kevelaer: Verlag Butzon & Bercker.Google Scholar
  13. Lull, José. 2005. El eclipse total de Sol del año 585 a.C. La sombra que envainó las espadas. Boletín Huygens 56,
  14. Martin, Th. Henri. 1864. Sur quelques prédictions d’éclipses mentionnées par des auteurs anciens. Revue Archéologique 9: 170–199.Google Scholar
  15. O’Grady, Patricia. 2002. Thales of Miletus. The Beginnings of Western Science and Philosophy. Aldershot: Ashgate.Google Scholar
  16. Panchenko, Dmitri. 1994a. Thales’s Prediction of a Solar Eclipse. Journal for the History of Astronomy 25: 275288.ADSMathSciNetGoogle Scholar
  17. Pannekoek, Anton. 1961. A History of Astronomy. New York: Dover Publications.Google Scholar
  18. Parpola, Simo. 1993. Letters from Assyrian and Babylonian Scholars. Helsinki: Helsinki University Press.Google Scholar
  19. Redshift 5.1. 2005 (CD-ROM). London: Focus Multimedia.Google Scholar
  20. Sachs, Abraham J. 1988. Astronomical Diaries and Related Texts from Babylonia, compl. and ed. by Hermann Hunger, vol. I, Diaries From 652 B.C. to 262 B.C. Vienna.Google Scholar
  21. Steele, John M. 2000. Eclipse Prediction in Mesopotamia’. Archive for the History of Exact Sciences 54: 421–454.CrossRefADSMathSciNetGoogle Scholar
  22. Steele, John M. and F.Richard Stephenson. 1997. Lunar Eclipse Times Predicted by the Babylonians. Journal for the History of Astronomy 28: 119–131.ADSMathSciNetGoogle Scholar
  23. Stephenson, Francis R. 1997. Historical Eclipses and Earth’s Rotation. Cambridge/New York: Cambridge University Press.CrossRefzbMATHGoogle Scholar
  24. Stephenson Francis R. and Louay J. Fatoohi. 1997. Thales’ Prediction of a Solar Eclipse. Journal for the History of Astronomy 28: 279–282.ADSGoogle Scholar
  25. White, Stephen A. 2008. Milesian Measures: Time, Space, and Matter’. In Patricia Curd and Daniel W. Graham, eds., The Oxford Handbook of Presocratic Philosophy, 89–133. Oxford: Oxford University Press.Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Dirk L. Couprie
    • 1
  1. 1.MaastrichtNetherlands

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