Answer: metaphor
Explanation:In the quote from Shakespeare's play "Romeo and Juliet," Romeo uses a metaphorical expression to compare Juliet to the sun. Metaphors are figures of speech that draw parallels between dissimilar things without using "like" or "as." By likening Juliet to the sun, Romeo suggests that she brings warmth, light, and radiance into his life, much like how the sun illuminates and brightens the world.
So, the correct literary device in the quote is a metaphor.