What does black rabbit sun mean?

Because the myth says that there is a golden three-legged crow in the sun, the ancients used "the sun" as another name for the sun, also known as "the red sun". For example, Han Yu's poem in the Tang Dynasty: "The sun just came out of the bottom of the sea"; Bai Juyi's poem: "The white rabbit walks when the red and black are advancing" (the sun and the moon chase each other). The ancients also used the metaphor of "flying rabbits walking" to describe how fast the days passed. Han Yu's poem "Li gives Zhang Eleven" says: "The sun goes to the bottom of the sea, and the clouds are scattered."