Nicolaus Copernicus "Almagest" circa 150 CE; the Earth was the stationary center of the universe. Stars were embedded in a large outer sphere which rotated rapidly, approximately daily, while each of the planets, the Sun, and the Moon were embedded in their own, smaller spheres. Ptolemy's system employed devices, including epicycles, deferents and equants, to account for observations that the paths of these bodies differed from simple, circular orbits centered on the Earth. Copernicus' major work on his heliocentric theory was "Dē revolutionibus orbium coelestium" ("On the Revolutions of the Celestial Spheres"), published in the year of his death, 1543. He had
Paris in the 16th century Beginning in 1522, wealthy Parisians loaned their money to the Bureau de Ville, the city government, which in turn made loans to the King. In exchange the King gave the city the right to collect certain taxes in Paris, and the Parisian investors received a healthy eight percent return for their loans to the city. By the second part of the 16th century, however, the Kings were so deeply in debt that wealthy Parisians refused to lend any more money; the King was forced to borrow money from Italian bankers, who received the right to receive a portion of French