Final answer:
Aristotle believed Earth was at the center of the cosmos, presenting a geocentric model as opposed to the heliocentric model proposed by some ancient Greeks.
Step-by-step explanation:
At the center of Aristotle's cosmological understanding was Earth. Unlike some ancient Greeks who suggested that the Sun might be at the center of our solar system, with Earth in motion around it, Aristotle argued against this idea. He believed Earth could not be revolving around the Sun because there would be observable parallax shifts in the positions of the stars if this were the case. In contrast to the heliocentric model, Aristotle's geocentric model placed a motionless Earth at the center of the cosmos, with all other celestial bodies revolving around it. Furthermore, Aristotle's approach to understanding the universe was systematic and based on observation, leading him to develop his doctrine of the four causes, which played a crucial role in explaining both the nature of things and the universe.