The Ptolemaic system was recorded in the book “Almagest” by the 2nd-century Greek philosopher Ptolemy. In the system the heavenly bodies circled the Earth attached to spheres. At center are the four elements of Earth, Water, Air and Fire. Then there are successive spheres for the Moon, Mercury, Venus, Sun, Mars, Jupiter and Saturn. The four outer spheres are: the Firmament (embedded with stars); the Crystalline Heaven; the Primum Mobile; and the Empyreal Heaven, the Abode of the Blessed.