A sorceress, who could bring the moon from heaven. Alluded to by Horace. (Epodes, v.)
Your ancient conjurors were wont To make her [the moon] from her sphere dismount, And to their incantations stoop.
Butler: Hudibras, part ii. 3.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894