Timeline of astronomy Rectification of Planetary Theory", eliminated the need for an equant by introducing an extra epicycle, departing from the Ptolemaic system in a way very similar to what Copernicus later also did. Ibn al-Shatir proposed a system that was only approximately geocentric, rather than exactly so, having demonstrated trigonometrically that the Earth was not the exact center of the universe. His rectification is later used in the Copernican model. Nicolaus Copernicus publishes "De revolutionibus orbium coelestium" containing his theory that Earth travels around the Sun. However, he complicates his theory by retaining Plato's perfect circular orbits of the planets. A brilliant
The Creation of the Sun, Moon and Vegetation another image of God points towards the Sun with his right hand and toward the faint Moon with his left. His face expresses the force needed for the creation of the abode of living beings. The abstract patterns of drapery emphasize the motion of both figures of God. "The Creation of the Sun, Moon and Planets" is featured on the postage stamps of Vatican City (issue of 1994) and India (issue of 1975). The Creation of the Sun, Moon and Vegetation The Creation of the Sun, Moon and Vegetation, (sometimes The Creation of the Sun, Moon, and Plants or The