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
Journey to the Planets Journey to the Planets Journey to the Planets is game for the Atari 8-bit family. The player takes on the role of an interplanetary adventurer who has to solve various puzzles on the planets on which he lands. The game was originally released on disk and cassette in 1982 by JV Software. In 1983, Roklan Software published a cartridge version with some differences from the original. When starting the game, you find yourself on a strange planet where you can equip yourself with a weapon, refuel your energy, and blast off into space in a spaceship. From here you must