Diodorus of Alexandria or Diodorus Alexandrinus was a gnomonicist, astronomer Diodorus of Alexandria." Complete Dictionary of Scientific Biography. 2008. Encyclopedia.com. 4 Dec. 2011 <http://www.encyclopedia.com>. [Retrieved 2011-09-15] and a pupil of Posidonius.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) archive.org [Retrieved 2011-09-15]John Antonakos amazon.com website page 92 of Noted Greeks of Antiquity [Retrieved 2011-09-15] thefreedictionary.com
Writings He wrote the first discourse on the principles of the sundial, known as Analemma.encyclopedia.com retrieved 15/09/2011 a commentary on this having later been written by Pappus of Alexandria, that is no longer extant. A small number of sentences having survived the centuries and attributed to him are known; these comment on: the differences between astronomy and natural science, the word meanings for cosmos and star, the nature of stars and the Milky Way. He was known to Eudoros. A few surviving passages might come from a commentary on Aratus. 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.
See also Alexandria Analemma Euclid History of sundials
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