Aratus of Soli was a highly original poet of the early third century BC, famous throughout antiquity for his poem on constellations and weather signs, and imitated by later Greek and Latin poets. This volume presents for the first time in English an edition of the poem with a full introduction, a facing translation and a line-by-line commentary. The text is based on a new reading of the manuscripts, including one not used before. The work provides a valuable basis for further research on Aratus and on Hellenistic poetry in general.