De astronomia (Latin: [deː äs̠t̪rɔˈnɔmiä]; Concerning Astronomy) is a book of stories written in Latin, probably during the reign of Augustus (c. 27 BC – AD 14). Attributed to "Hyginus", the book's true author has been long debated. However, the art historian Kristen Lippincott argues that the author was likely Gaius Julius Hyginus, who served as the superintendent of the Palatine library under Caesar Augustus.
The text describes 47 of the 48 Ptolemaic constellations, centering primarily on the Greek and Roman mythology surrounding the constellations, though there is some discussion of the relative positions of stars. The stories it contains are chiefly based on Catasterismi, a work that was traditionally attributed to Eratosthenes.
