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

  title={The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel},
  author={Frank Verbunt and Andreas Schrimpf},
  journal={Astronomy \& Astrophysics},
We analyse a manuscript star catalogue by Wilhem IV, Landgraf von Hessen-Kassel from 1586. From measurements of altitudes and of angles between stars, given in the catalogue, we find that the measurement accuracy averages 26″ for eight fundamental stars, compared to 49″ of the measurements by Brahe. The computation in converting altitudes to declinations and angles between stars to celestial positions is very accurate, with errors that are negligible with respect to the measurement errors. Due… 
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