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
Battle of the Planets Planets" is the title of American adaptation of this series created by Frank. Frank authorized new footage and hired writers to add dialogue to fit the look of the animation, without reference to original scripts. Of the 105 original "Gatchaman" episodes, 85 were used in the "Battle of the Planets" adaptation produced by Sandy Frank Entertainment in 1978. "Battle of the Planets" cast five young people as G-Force, consisting of Mark, Jason, Princess, Keyop, and Tiny. G-Force protects Earth from the planet Spectra and other attacks from beyond space. The most prominent field commander of the Spectra forces was a