LitCharts assigns a color and icon to each theme in The Sun is Also a Star, which you can use to track the themes throughout the work.
Immigration and the American Dream
Passion vs. Reason
Interconnectedness and Destiny
Isolation vs. Connection
Summary
Analysis
Hannah thinks of herself as living in a fairy tale, though not as the star. She thinks that she's a minor character, like a cook or a handmaiden. When she met and began working for Attorney Jeremy Fitzgerald, she finally began to think that she could be the star of her story. He was her one true love, even if he was a married man with children. She never thought that he'd return her affection—until today.
The shift that Hannah undergoes when she begins working for Attorney Fitzgerald illustrates clearly that love has the power to fundamentally change how a person thinks about their lot in life.