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
Stranger to the Sun published as official "Buffy"/"Angel" merchandise. Stranger to the Sun Stranger to the Sun is an original novel based on the U.S. television series "Angel". Wesley opens a strange package that arrives by special delivery, which instantly sends him into a slumber. It seems likely he is the victim of a spell. Angel leaves with Gunn to investigate. They discover that other people who might be able to assist, such as magick-shop owners, have also fallen victim exactly like Wesley. Meanwhile Cordy is struggling to research without Wes available. She soon begins to uncover a plot to plunge Earth into eternal