The Angry Sun is an enemy that only appears in World 2-4: The Sun HATES You. It doesn't move or attack the player until the player moves on for a short time. During the Night, the Angry Sun is replaced with the Angry Moon.
Trivia
The Angry Sun and the Angry Moon behaves the same way as the Angry Sun in Super Mario Bros. 3.
The Angry Moon's appearance close resembles to the Moon from The Legend of Zelda: Majora's Mask.
