What philosophical division did the observation of an imperfect Moon help dissolve?

Answer

The division between the corruptible sublunary world and the unchanging superlunary realm.

Discovering that the Moon was imperfect suggested that the heavens were not fundamentally different in composition or condition from Earth, thereby dissolving the rigid division between the corruptible terrestrial realm and the unchanging celestial realm.

What philosophical division did the observation of an imperfect Moon help dissolve?
physicsdiscoveryGalileoscienceastronomia