The Catasterismi or Catasterisms (Greek Καταστερισμοί Katasterismoi, "Constellations" or "Placings Among the Stars"[1]) is a lost work by Eratosthenes of Cyrene. It was a comprehensive compendium of astral mythology including origin myths of the stars and constellations. Only a summary of the original work survives, called the Epitome Catasterismorum, by an unknown author sometimes referred to as pseudo-Eratosthenes.[2]