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The theory of heliocentrism, which states that the Earth and other planets revolve around the Sun, was proposed by the ancient Greek astronomer Aristarchus of Samos. However, it was popularized and further developed by Nicolaus Copernicus in the 16th century.
That was the earliest version of atomic theory, proposed by the Greek philosopher Democritus.Democritus
The Ptolemaic universe theory was proposed by the ancient Greek astronomer Claudius Ptolemy in the 2nd century AD. He proposed a geocentric model of the universe with Earth at the center, and this theory dominated Western astronomy for over a thousand years.
Nicolaus Copernicus, the person who suggested that the sun was at the center of the solar system, was from Poland. His heliocentric model challenged the prevailing geocentric view of the universe.
Copernicus's concept of the solar system was influenced by the ancient Greek astronomer Aristarchus of Samos, who proposed a heliocentric model in which the Earth and other planets revolved around the Sun. Copernicus built upon this idea and formulated his own heliocentric model in the 16th century.