Which of the following astronomer first proposed that sun is static and earth rounds sun

The correct option is Copernicus.

Step-by-step Explanation:

Historically, the dominant view of the universe was the geocentric model, which placed the Earth at the center of the universe with the Sun, Moon, stars, and other planets revolving around it. This model was highly popularized by Ptolemy in ancient times.

In the 16th century, the Polish astronomer Nicolaus Copernicus proposed a revolutionary mathematical model of the universe. In his landmark book, De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres), published in 1543, he formulated the heliocentric model.

The heliocentric model proposed that:
1. The Sun is static (stationary) and lies near the center of the universe.
2. The Earth and other planets orbit (round) the Sun in circular paths.

Although ancient thinkers like Aristarchus of Samos had suggested heliocentric ideas much earlier, Copernicus was the first in the modern scientific era to provide a detailed, comprehensive astronomical and mathematical model supporting this theory.

Therefore, Copernicus is the astronomer who first systematically proposed that the Sun is static and the Earth rounds the Sun.