Nicolaus Copernicus "Almagest" circa 150 CE; the Earth was the stationary center of the universe. Stars were embedded in a large outer sphere which rotated rapidly, approximately daily, while each of the planets, the Sun, and the Moon were embedded in their own, smaller spheres. Ptolemy's system employed devices, including epicycles, deferents and equants, to account for observations that the paths of these bodies differed from simple, circular orbits centered on the Earth. Copernicus' major work on his heliocentric theory was "Dē revolutionibus orbium coelestium" ("On the Revolutions of the Celestial Spheres"), published in the year of his death, 1543. He had
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