Adnan Oktar (Harun Yahya)
The throughout the years, people have observed their universe and tried to uncover its secrets. To answer some thorny questions, many scientists have made important discoveries, considering the restrictions of the age they lived in; and others have been noteworthy in their own times, yet the claims they made later came to be regarded as scientific errors.
Claudius Ptolemy was a scientist and philosopher of the second century CE, who lived in Alexandria when it was the center of scientific research. He observed the skies in order to learn about the universe and the world's place in it and pondered the movements of the Sun, Moon and stars. Finally, he concluded that the Earth must be the center of the universe. According to his theory, the Earth was motionless, and the Sun, Moon and the stars all rotated around it.
