Arrianus () was an astronomer of ancient Greece who probably lived as early as the time of Eratosthenes (that is, the 2nd century BCE), and who wrote a work on meteors, of which a fragment is preserved in Joannes Philoponus's commentary on the Meteorologica of Aristotle.
He also wrote a short work on comets, to prove that they had no supernatural significance and foreboded neither good nor evil.Agatharchid. apud Phot. p. 460b. ed. Bekker. Some writers ascribe this work to Arrian instead. A few fragments of it are preserved in Stobaeus.Stobaeus, Eclog. Phys. 1.29 and 30
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