Catasterismi (Greek Katasterismoi, "placings among the stars") is an Alexandrian prose retelling of the mythic origins of stars and constellations, as they were interpreted in Hellenistic culture. The work survives in an epitome assembled at the end of the 1st century AD, based on a lost original, with a possible relation to work of Eratosthenes that is now hard to pinpoint. Apparently it was pseudepigraphically attributed to the great astronomer from Cyrene, to bolster its credibility. However, the astrological connoisseurship of its fables in fact have nothing to do with Eratosthenes' scientific conjectures and solutions—which belong instead near the origins of an astronomy that was separated from the predictive and interpretive functions of astrology, not an easy feat of the logical imagination. The separation was effected in Alexandrian intellectual circles during the 1st century BC.
Castasterismi records the mature and definitive development of a long process: the Hellenes' assimilation of a Mesopotamian zodiac, transmitted through Persian interpreters and translated and harmonized with the known terms of Greek mythology. A fundamental effort in this translation was the application of Greek mythic nomenclature to designate individual stars, both asterisms like the Pleiades and Hyades, and the constellations. In Classical Greece, the "wandering stars" and the gods who directed them were separate entities, as for Plato; in Hellenistic culture, the assocation became an inseparable identification, so that Apollo, no longer the regent of the Sun, actually was Helios (Seznec 1981, pp 37–40).
Chapters 1–42 of Catasterismi treat forty-three of the forty-eight constellations known to Ptolemy (second cent. AD); chapters 43–44 treat the five planets and the Milky Way.
Many of the mythic themes in Catasterismi are simply drawn from Aratus, Phaenomena (ca 275 BC) and the sequential arrangement is essentially that of Aratus as well. On the other hand, a similar later account is De astronomia (tellingly also titled De astrologia in some manuscripts that follow Hyginus' usage in his text) attributed to Hyginus. During the Renaissance, printing of Catasterismi, invariably attributed to Eratosthenes, began early, but the work was always overshadowed by Hyginus, illustrated by woodcuts in the first illustrated edition by Erhard Ratdolt, Venice 1482. Johann Schaubach's edition of Catasterismi was also illustrated with celestial maps drawn from another work, Johann Buhle's Aratus (Leipzig, 2 volumes, 1793-1801).
- Cathy Bell, "The mythology of the constellations"
- Italica: Rinascimento: Ilaria Miarelli Mariani, "Astrologia"] (in Italian)
- Bradley E. Schaefer, "The epoch of the constellations on the Farnese Hercules and their origins in Hipparchus's lost catalogue"
- Seznec, Jean. 1981 The Survival of the Pagan Gods. (Princeton, NJ: Princeton University Press)
- Condos, Theony. 1997. Star Myths of the Greeks and Romans: A Sourcebook A translation of the Catasterismi and De Astronomia attributed to Hyginus. The only available Enlish translation, reviewed by Roger Ceragioli in Journal for the History of Astronomy, 30.1 (1999) pp 313–315; by John McMahon in Archaeoastronomy: The Journal of Astronomy in Culture, XVI (2001) pp 98-99  and by John T. Ramsey, as "Bryn Mawr Classical Review 98.6.28" .
Medieval Greece / Byzantine Empire
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