Model

Author

Concept

Heliocentric model

Nicolaus Copernicus

center of the Universe lies at the center of a spherical, stationary Earth, around which the sun, moon, planets, and stars rotate.

Geocentric Model

1. Developed by philosophers in Ancient Greece.
2. Ptolemy proposed his refined geocentric model.

1.  Earth is at the orbital center of all celestial bodies.

2. In the Ptolemaic universe, a planet moves in a small circle called an epicycle, and the center of the epicycle moves along a larger circle around the Earth.