3. Correctly name the following astronomers based on the information given.

Question

Developed a model that had a fixed, non- moving Earth as the center of the universe. Incorrectly proposed that all bodies in the sky moved around the Earth.
Improved on the Aristotle's model. Explained retrogade motion and he claimed that planets moved in small circles called epicycles.
Used their calculation to propose a new model of the solar system with the sun at the center, known as the heliocentric model.

Answer 1

1. The astronomer who developed a geocentric model with a fixed, non-moving Earth at the center of the universe is Claudius Ptolemy.

2. The astronomer who improved on Aristotle's model and explained retrograde motion using epicycles is Hipparchus, and further developed by Claudius Ptolemy in his own model.

3. The astronomers who used their calculations to propose the heliocentric model with the Sun at the center of the solar system are Nicolaus Copernicus and later supported by Johannes Kepler and Galileo Galilei.