Answer:
A. First one with Sun at the center.
Explanation:
Aristarchus was a Greek scientist who proposed the theory that its not Earth which is fixed, its the Sun that has a fixed position and is placed at center where are all other planets are located at some distance from it and revolve around it. This theory is referred as "Heliocentric".
Answer:
The most complete geocentric model, with over 80 distinct circles, is called the. Ptolemy.
