Aristotle

Definition

Aristotle was an ancient Greek philosopher whose works covered a broad range of subjects, including astronomy. He proposed a geocentric model of the universe, where Earth is at the center and all celestial bodies revolve around it.

5 Must Know Facts For Your Next Test

1. Aristotle's geocentric model influenced astronomical thought for nearly two millennia.
2. He believed that the heavens were composed of a different substance called 'aether,' which was perfect and unchanging.
3. Aristotle's observations included the idea that celestial bodies move in perfect circles.
4. He argued that the Earth is spherical based on observations like the shape of Earth's shadow during lunar eclipses.
5. Aristotle's ideas were later challenged by astronomers such as Copernicus and Galileo who supported heliocentric models.

Review Questions

Related terms

Geocentric Model:

A description of the universe with Earth at its center.

Aether: In ancient Greek philosophy, aether is the material believed to fill the region of the universe above the terrestrial sphere.

Heliocentric Model:

A description of the universe with the Sun at its center, proposed by Copernicus.