Nicholas Copernicus was renaissance astronomer that challenged the astronomical beliefs that were taught in the past. Among these is the refutation of the theory of the great philosopher Aristotle. It was widely believed that the Earth was the center of the universe and that every celestial body orbited around it. However, Copernicus contradicted this theory due to his dedicated study made long ago when he lived as a canon in the cathedral of Frombork. Even though, he did not own a telescope he used wooden yardsticks to measure the angular altitude of two bodies in the sky. He even solved Ptolemy's model and published in his book “Little Commentary” his findings which he called them the heliocentric theory. His discovery was without a doubt
