Bion of Abdera (Greek: Βίων ὁ Ἀβδηρίτης, gen. Βίωνος) was a Greek mathematician of Abdera, Thrace, and a pupil of Democritus, who lived around 560 BCE. He wrote both in the Ionic and Attic dialects, and was the first who said that there were some parts of the Earth in which it was night for six months, while the remaining six months were one uninterrupted day.
- This article incorporates text from a publication now in the public domain: Smith, William, ed. (1870). "Bion". Dictionary of Greek and Roman Biography and Mythology. p. 488.