According to the book "Aristotle - On the Heavens BK II", give me a 200 words deep question .

In the book "Aristotle - On the Heavens BK II", Aristotle delves into the complexities of the universe, its composition, and its movements. Based on his philosophical and scientific explorations, how does Aristotle reconcile the apparent contradiction between the perfection and immutability of the heavens, as suggested by the circular motion of the celestial bodies, and the inherent changeability and imperfection of the earthly realm? How does his explanation reflect on the broader Aristotelian philosophy of the relationship between form and matter, potentiality and actuality, and how does it contribute to our understanding of the dichotomy between the terrestrial and celestial realms?