No, Aristotle did not propose the sun as the center of the universe. In fact, he strongly believed in the geocentric model, which places the Earth at the center of the universe.

Here's why:

* Aristotle's Observations: Aristotle's observations, like the lack of parallax (apparent shift in position of stars due to Earth's movement around the sun), led him to believe the Earth was stationary.

* His Philosophical System: His philosophy emphasized the idea that the Earth, as the home of humans, was the most important and perfect object in the universe, hence it must be at the center.

It was Nicolaus Copernicus in the 16th century who challenged Aristotle's geocentric model and proposed the heliocentric model, placing the sun at the center of the solar system.