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Copernicus' observations of the heavens were made with the naked eye. He died more than fifty years before Galileo became the first person to study the skies with a telescope. From his observations, Copernicus concluded that every planet, including Earth, revolved around the Sun. Copernicus conducted his studies over many years and was well acquainted with the Ptolemaic theory. Copernicus noticed that all of the planets, apart from the sun, have the same annual movement, and he thought that this movement might be explained by the annual movement of the earth around the sun. His proposed theory replaced Ptolemy’s geocentric model which was accepted and believed for more than 1,000 years. He claims that the Earth is the center of the universe. Copernicus’s theories made a lot of people uncomfortable and somewhat upset but he was actually respected as a canon and regarded as a renowned astronomer. Contrary to popular belief, the Church accepted Copernicus' heliocentric theory before a wave of Protestant opposition led the Church to ban Copernican views in the 17th century. Nicolaus Copernicus heliocentric theory is important today, because it led to the advancement and accuracy in astronomical tools, both physical and mathematical and changed the way scientists understand the design of our solar system. Thank you for listening and have a good day.