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Diodorus of Alexandria or Diodorus Alexandrinus was a gnomonicist, astronomer [1] and a pupil of Posidonius.[2][3][4]


He wrote the first discourse on the principles of the sundial, known as Analemma.[5] a commentary on this having later been written by Pappus of Alexandria,[6] that is no longer extant.[7] A small number of sentences having survived the centuries and attributed to him are known; these comment on:the differences (for the purpose of defining) between astronomy and natural science (physiologia [8]) the word meanings for cosmos and star, the nature of (the things being) stars and Γαλαξίαςor [9] [Galaxias [10] kuklos,[11][12][13] (those things which are altogether stars are called today the Milky Way)]. He was known to Eudoros. In his dealings with astronomy he was known to Marinus in his commentary on Euclid's Data containing quotes of Diodorus's opinions on the meaning of a term, [14]

See alsoEdit


  1. ^ Diodorus of Alexandria." Complete Dictionary of Scientific Biography. 2008. 4 Dec. 2011 <>. [Retrieved 2011-09-15]
  2. ^ Aristarchus of Samos and Sir Thomas Little Heath ...the ancient Copernicus; a history of Greek astronomy to Aristarchus, together with Aristarchus's Treatise on the sizes and distances of the sun and moon: a new Greek text with translation and notes (1913) [Retrieved 2011-09-15]
  3. ^ John Antonakos website page 92 of Noted Greeks of Antiquity [Retrieved 2011-09-15] ISBN 1-4033-2565-0
  4. ^
  5. ^ retrieved 15/09/2011
  6. ^ Sir Thomas Little Heath Retrieved 2011-12-04 ISBN 0-486-24074-6
  7. ^ Heike Sefrin-Weis (2010) Retrieved 2011-12-04 ISBN 1-84996-004-6
  8. ^ © 2001-2011 Douglas Harper Retrieved 2011-09-15
  9. ^ Kosmas Milt Markatos (2010) website (referencing definition of greek) Retrieved 2011-09-15
  10. ^ Retrieved 2011-09-15
  11. ^ Retrieved 2011-09-15
  12. ^ website Retrieved 2011-09-15
  13. ^ Prof. Richard Pogge kuklos reference Retrieved 2011-09-15
  14. ^ Otto Neugebauer A history of ancient mathematical astronomy, Volume 2 Retrieved 2011-09-15