This is the editio princeps, based on new papyrus discoveries, of a Greek poem on astrology by an author whose notorious collaborations with Simon Magus is novelistically recounted in the Clementina. A versified handbook of horoscopes and introduction to the sciences, it is the only Greek astrological poem to have been written in elegiac couplets, and ist a new accession to the corpus of didactic poetry in the tradition of Aratus' Phaenomena, Manilius' Astronomica, and Ovid's Fasti. The edition offers a collection and complete re-edition of the remains of the poem's original four books: published and unpublished papyri, plus fragments and testimonia preserved in the secondary tradition.