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Near the end of the 16th century Wilhelm IV, Landgraf von Hessen-Kassel, setup an observatory with the main goal to increase the accuracy of stellarpositions primarily for use in astrology and for calendar purposes. A new starcatalogue was compiled from measurements of altitudes and angles between starsand a print ready version was prepared listing measurements as well asequatorial and ecliptic coordinates of stellar positions. Unfortunately, thiscatalogue appeared in print not before 1666, long after the dissemination ofBrahe's catalogue. With the data given in the manuscript we are able to analyzethe accuracy of measurements and computations. The measurements and thecomputations are very accurate, thanks to the instrument maker andmathematician Jost B\"urgi. The star catalogue is more accurate by a factor twothan the later catalogue of Tycho Brahe.

The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel