WORLD HISTORY

Detailed explanation-1: -In astronomy, the geocentric theory of the universe is the idea that the Earth is the center of the universe and other objects go around it. Belief in this system was common in ancient Greece.

Detailed explanation-2: -In the Catholic world prior to Galileo’s conflict with the Church, the majority of educated people subscribed to the Aristotelian geocentric view that the Earth was the centre of the universe and that all heavenly bodies revolved around the Earth, though Copernican theories were used to reform the calendar in 1582.

Detailed explanation-3: -According to Penn State University, the ancient Greeks firmly held onto several scientific assumptions that formed the basis of the geocentric model: The Earth is the center of the universe and is stationary. The planets, sun and stars revolve around Earth.

Detailed explanation-4: -Most Greek philosophers believed in a geocentric (Earth-centered) cosmos.

Detailed explanation-5: -Nicolaus Copernicus in his De revolutionibus orbium coelestium ("On the revolution of heavenly spheres", first printed in 1543 in Nuremberg), presented a discussion of a heliocentric model of the universe in much the same way as Ptolemy in the 2nd century had presented his geocentric model in his Almagest.

Detailed explanation-6: -In the fifth century b.c. the Pythagorean astronomer Philolaus departed from the geocentric model. He suggested that the Earth revolved not around the Sun, but around a cosmic central fire, around which the Sun also revolved.