This simplified drawing illustrates the planetary scheme of Tycho Brahe (1546-1601). Scholars label this model geoheliocentric. Please note that Earth is at the center of the sphere of fixed stars and the Sun revolves annually around the fixed, central Earth. The planets, in turn, revolve around the Sun. The Tychonic scheme, like the Ptolemiac, requires diurnal rotation of the sphere of fixed stars (not illustrated), which daily rotates the entire planetary entourage. Note that the Tychonic scheme illustrated above would incorprate the modified lunar model of Copernicus, as well as Copernicus’ positions of Mercury and Venus. Relative distances and other dimensions are not drawn to scale.