Geocentric model coelestium" ("On the Revolutions of the Heavenly Spheres"), which posited that the Earth and the other planets instead revolved around the Sun. The geocentric system was still held for many years afterwards, as at the time the Copernican system did not offer better predictions than the geocentric system, and it posed problems for both natural philosophy and scripture. The Copernican system was no more accurate than Ptolemy's system, because it still used circular orbits. This was not altered until Johannes Kepler postulated that they were elliptical (Kepler's first law of planetary motion). With the invention of the telescope in 1609,
Iron Mountain Central Historic District Iron Mountain Central Historic District The Iron Mountain Central Historic District is a historic district, broadly located between Fleshiem and C Streets and between Iron Mountain and Stockbridge Avenues in Iron Mountain, Michigan. The district covers the city's central business district and adjacent areas. It is primarily commercial, but also contains the historic county courthouse complex, and school, library, and church buildings. It was listed on the National Register of Historic Places in 2013. Lake Superior Iron Ranges]] A major iron ore deposit was discovered near what is now Iron Mountain in 1878/79; the first ore from the first area