reimers was a bitter rival of tycho brahe (his successor as imperial mathematician) after he tried to claim the tychonic system as his own. tycho complained that ursus had plagiarized both his system of the world, as well as the publication of the mathematical model of prosthaphaeresis. history has sided with ursus on the later issue, and he had stated that the technique was the invention of paul wittich and jost bürgi.