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The ancient Greek mathematician Pythagoras suggested that the Earth is spherical -
Ptolemy developed Aristotle’s geocentric theory of the universe in about 150 CE. Ptolemy knew that the planets don’t appear to orbit in perfect circles around the Earth.[ -
The ancient Greek philosopher Aristotle extended Eudoxus’ model of the universe in the 4th century BCE. Aristotle’s model of the universe was also geocentric, with the Sun, Moon, planets, and stars all orbiting the Earth inside of Eudoxus’ spheres. -
The Polish astronomer Nicolaus Copernicus reintroduced the idea of a heliocentric universe in On the Revolutions of the Celestial Spheres, first published in 1543.
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