Question

which astronomer worked out the model of the solar system with earth in the centre? ptolemy galileo johannes nicolaus

Explanation:

The geocentric model (Earth - centered) of the Solar System was developed by Ptolemy. Galileo supported the heliocentric model (Sun - centered) with his observations, Johannes (Kepler) worked on laws of planetary motion in the heliocentric framework, and Nicolaus (Copernicus) proposed the heliocentric model.

Answer:

A. Ptolemy