but unlike tycho's geoheliocentric system in which the earth does not rotate and the martian and solar orbits intersect, in that of ursus and his follower roslin the earth had a daily rotation and also the martian and solar orbits do not intersect, thus avoiding the tychonic conclusion in respect of the martian orbit that there are no solid celestial spheres on the ground that they cannot possibly interpenetrate. but on the other hand the orbits of mercury and venus would obviously intersect the martian orbit in reimers' illustration of his model, and indeed also intersect jupiter's orbit.