Question

Whose
heliocentric model is
seen as the first step
in the development
of modern models
of the solar system?​

Answer 1

The heliocentricity observation is dated back to two millenniums ago, in the works of Aristarchus (3C BCE) and of Selucius (2C BCE). Copernicus (16C AD) made a heliocentric model..

Explanation:

16th century Copernicus was the first to make a heliocentric model with Earth circling Sun, very fast, and stars moving around, very slowly.