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 keep the distinguished scientist, he offered Tycho the island of Hven in Øresund and funding to set up an observatory. Until then, Hven had been property directly under the Crown, and the 50 families on the island considered themselves to be freeholding farmers, but with Tycho Brahe's appointment as Feudal Lord of Hven, this changed. Tycho took control of agricultural planning, requiring the peasants to cultivate twice as much as they had done before, and he also exacted corvée labor from the peasants for the construction of his new castle. The peasants complained about Brahe's excessive taxation and took him