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 science on one hand and religion and astrology on the other. Using his large herbal garden at Uraniborg, Tycho Brahe produced several recipes for herbal medicines, using them to treat illnesses such as fever and plague. In his own time, Tycho was also famous for his contributions to medicine; his herbal medicines were in use as late as the 1900s. The expression Tycho Brahe days, in Scandinavian folklore, refers to a number of "unlucky days" that were featured in many almanacs beginning in the 1700s, but which have no direct connection to Tycho Brahe or his work. Whether because he