Answer : 3. "कॉपरनिकस"
Explanation :

Nicolaus Copernicus was an astronomer who proposed a heliocentric system, that the planets orbit around the Sun.

He is a Polish astronomer who put forth the theory that the sun is at the centre of the Universe.

Copernicus finished the first manuscript of his book, "De Revolutionibus Orbium Coelestium" ("On the Revolutions of the Heavenly Spheres") in 1532.

In it, Copernicus established that the planets orbited the sun rather than the Earth.

He discovered the solar system model and the planets' path.