Scientist:Aristarchus of Samos

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Aristarchus of Samos lived between (310 BC - 230 BC) a great Greek astronomer and mathematician, from the ancient Alexandrian school.

He was born in Samos, Greece. Aristarchus is distinguished by his bold astronomical thought. He studied astronomy and made many important achievements in it, the most important of which is his idea about the centrality of the sun within the solar system, making the sun the center of the universe instead of the earth, and he preceded the theory of Copernicus by about 18 centuries.

He was influenced by the thought of the philosopher Philolaus, one of the followers of Pythagoras, although Philolaus had established a central fire around which the earth, sun, moon, five planets and the dome of stars revolve.
Aristarchus' theory revolves around the sun being at the center of the universe and the earth revolving around it annually, and at the same time revolving around its axis daily, and all five planets (at that time) revolve around the sun, except for the moon, which revolves around the earth.
As for the stars, they are fixed and their daily movement is nothing but a trick caused by the Earth’s rotation around its axis in the opposite direction. He concluded this based on his certainty that the sun is larger than the moon and the Earth. It is not reasonable for the small-sized Earth to control a large star like the sun.