Tycho Brahe produce much of his astronomical data, Tycho relied heavily on the then new technique of "prosthaphaeresis", an algorithm for approximating products based on trigonometric identities that predated logarithms. Although Tycho admired Copernicus and was the first to teach his theory in Denmark, he was unable to reconcile Copernican theory with the basic laws of Aristotelian physics, that he considered to be foundational. He was also critical of the observational data that Copernicus built his theory on, which he correctly considered to have a high margin of error. Instead, Tycho proposed a "geo-heliocentric" system in which the Sun and Moon orbited
Tycho Brahe he would accept one in exchange for a horse, Tycho replied with the sad news that the elk had just died on a visit to entertain a nobleman at Landskrona. Apparently, during dinner, the elk had drunk a lot of beer, fallen down the stairs, and died. Among the many noble visitors to Hven was James VI of Scotland, who married the Danish princess Anne. After his visit to Hven in 1590, he wrote a poem comparing Tycho Brahe with Apollon and Phaethon. As part of Tycho's duties to the Crown in exchange for his estate, he fulfilled the functions