The astronomer Nicolaus Copernicus was born in Poland on February 19th, 1473. He advocated the heliocentric theory, which placed the sun in the center of the solar system, with the earth and other planets revolving about it. Copernicus received praise and encouragement from the Bishop of Kulm and the Archbishop of Capua and some scholars, but his ideas were also ridiculed by others including Martin Luther, who once said, “This fool wants to turn the whole art of astronomy upside down!”. Until the middle of the 17th century, the teachings of ancient Greek philosophers like Aristotle were considered the final word on matters scientific, and Copernicus’ new system wasn’t any more accurate than the old geocentric, or earth-centered model. But the heliocentric or Copernican model eventually simplified and explained the motions of the planets better than the geocentric system.