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
Sun goddess of the Earth The Weather god of Nerik was her son with the god , while the Weather god of Zippalanda was her son by the . The Sun goddess of the Earth, as a personification of the chthonic aspects of the Sun, had the task of opening the doors to the Underworld. She was also the source of all evil, impurity, and sickness on Earth. In the Hurrian-Hittite "Song of the Ransom," the Sun goddess of the Earth / Allani invites the king of the gods, Tarḫunna/Teššub and his brother Šuwaliyat/Tašmišu to a feast in the Underworld and dances before them. Otherwise