Yes. Contrary to popular belief, by the time of Copernicus scholars knew Earth to be round.
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Nicolaus Copernicus proposed a heliocentric model of the universe where the Earth and other planets revolve around the Sun, challenging the prevailing geocentric view of the medieval period that placed Earth at the center. This shift in perspective laid the foundation for modern astronomy and our understanding of the solar system.
Nicolaus Copernicus was a Renaissance-era mathematician and astronomer who developed the heliocentric model of the universe, which placed the Sun at the center of the solar system with the planets, including Earth, revolving around it. His theory revolutionized our understanding of the cosmos and laid the foundation for modern astronomy.
Galileo did not prove that Earth was not flat (It had already been agreed that it was round). Galileo invented the telescope and used it to prove that there were objects which did not orbit the Earth, supporting Copernicus' Heliocentric model for the universe. The Earth was known to be round by the ancient Greeks, but I do not who it found out initially (sorry).
He did not need to discover that as it was already known by the ancient Greeks.
Nicolas Copernicus invented the heliocentric model of the universe, which placed the Sun at the center of the solar system with the planets orbiting around it. This model challenged the existing geocentric view, where the Earth was considered the center of the universe. Copernicus's work laid the foundation for modern astronomy.