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
The Earth Sings Mi Fa Mi press release via Absolutepunk.net: "The title, "The Earth Sings Mi Fa Mi" was taken from a book written by a late 16th century astronomical theorist by the name of Johannes Kepler ["Harmonices Mundi"] and the publication just fascinated the band. Kepler’s theory suggested that each of the 9 planets in our solar system produced tones as they orbited the sun. Throughout the orbit, Venus would stay a consistent note that was considered the 6th in relation to the rest of the planets. As Earth would shift its tonality, it would create the effect of the notes moving from the major