Examples of using "Ptolemäus" in a sentence and their english translations:
Ptolemy was a Greek astronomer.
Copernicus felt that Ptolemy's theory was incorrect. Sometime between 1507 and 1515, he first circulated the principles of his heliocentric or Sun-centered astronomy.
The heliocentric view of the world, in which the Sun is at the centre of the universe, is also described as the Copernican system. It represents a step forward from the geocentric view of Ptolemy.
Like most astronomers before him, Ptolemy believed the Sun, Moon, and other planets circled the Earth. He thought that each space body moved in a small circle (an epicycle) that was itself orbiting Earth.