What knowledge about the Earth as a planet did the ancient scientists of Europe have?

European scientists, many years ago, had maps that were largely similar to modern ones. After the discovery of America, geographic knowledge was greatly enhanced. New continents were mapped and new trade routes were created, such as the trade route to India. Thanks to the development of astronomy, scientists had an idea of the movement of celestial bodies, there were theories that suggested the presence of magnetic fields at the poles of the Earth.