Final answer:
The Twilight mentioned in the sonnet is a metaphor for a specific time of day. It is used to describe the fair eyes of the subject and her dusky hair, comparing them to the beauty of twilight. The poet uses this imagery to convey the enchanting and captivating nature of the subject.
Step-by-step explanation:
The Twilight mentioned in the sonnet is a metaphor for a specific time of day. It is used to describe the fair eyes of the subject and her dusky hair, comparing them to the beauty of twilight. The poet uses this imagery to convey the enchanting and captivating nature of the subject.