Final answer:
The delay in departure from Circe's Island is due to Attis' castration and his subsequent recovery with the help of the goddess Cybele.
Step-by-step explanation:
The delay in departure from Circe's Island is mentioned in various texts, including a passage from Virgil's Aeneid. In the story, the protagonist, Attis, arrives at Circe's Island and is filled with rage and madness. He castrates himself, and the goddess Cybele comes to his aid, using a tambourine to calm him down. The delay in departure refers to the time it takes for Attis to recover from his ordeal and for Cybele to prepare him for the journey.