Callimachus' epigram Epigr. 27 Pf. (= AP 9.507, Gow-Page 56) in praise of Aratus is notoriously difficult of interpretation, but it is hoped that a new emendation and interpretation of the fourth line will resolve some of the difficulties, as well as lead us to a new interpretation of Meleager's reference to Aratus in AP 4.1. After discussion of the merits of manuscript readings and previous emendations of Epigr. 27, an emendation of a single letter in the penultimate word is proposed and supported by arguments based on scholia and citations from pre- and post-Callimachean texts, including Aratus' Phaenomena, the subject of the epigram in question. Finally it is argued that a dialectal jeu d'esprit based on Aratus' name in the second line of the Phaenomena is also present in Epigr. 27.4 and echoed by Meleager in AP 4.1.49.