Why Immanuel Kant suggests that his approach embodies a copernican revolution in epistemology?

Kant suggests that his approach embodies a Copernican revolution in epistemology because he shifts the focus from the mind passively receiving knowledge from the external world to the mind actively constructing knowledge through its own concepts and categories. This puts human cognition at the center of understanding, similar to how Copernicus shifted the focus from Earth being the center of the universe to the sun.