An Analysis of Errors in the Star Catalogues of Ptolemy and Ulugh Beg

  title={An Analysis of Errors in the Star Catalogues of Ptolemy and Ulugh Beg},
  author={Mikhail Shevchenko},
  journal={Journal for the History of Astronomy},
  pages={187 - 201}
  • M. Shevchenko
  • Published 1 May 1990
  • Physics
  • Journal for the History of Astronomy
The main peculiarity of Ptolemy's catalogue is the mean systematic error in the longitudes of the stars exceeding 1 • Many astronomers, in a European tradition going back to Tycho Brahe, I have considered the presence of such error to be an unambiguous indication that the catalogue was borrowed and modified rather than being a product of direct observations. Analysis of the fractional degrees of star coordinates by R. R. Newtonseemingly confirmed the artificial origin of the longitudinal shift… 

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