Orrery on display in Kassel at the Astronomisch-Physikalisches Kabinett and in Dresden at the Mathematisch-Physikalischer Salon. In "De revolutionibus orbium coelestium", published in Nuremberg in 1543, Nicolaus Copernicus challenged the Western teaching of a geocentric universe in which the Sun revolved daily around the Earth. He observed that some Greek philosophers had proposed a heliocentric universe. This simplified the apparent epicyclic motions of the planets, making it feasible to represent the planets' paths as simple circles. This could be modelled by the use of gears. Tycho Brahe's improved instruments made precise observations of the skies (1576–1601), and from these Johannes Kepler
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