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Appendices: Related Texts and Translations

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Chapter Summary

This chapter presents Rothmann's successive letters to Landgrave Wilhelm IV of Hesse-Kassel, allowing for both the reconstruction of the precise course of observation of the comet and the genesis of Rothmann's treatise on it, the Dialexis Cometae. In the first letter, which must have been written, at the latest, on 9 October, Rothmann describes the successive positions of the comet in longitude and latitude, as well as its daily motion in both longitude and latitude. He also points out that he has determined the successive distances in relation to two reference stars, which form part of the basic system of reference in the stellar catalogue under preparation. The mathematicus indicates that the comet appears to bear a relation with Saturn, towards which it runs in a straight line and with which it will foreseeably conjoin in a period of eight days.

Keywords: Christoph Rothmann; comet; Dialexis Cometae; Landgrave Wilhelm IV of Hesse-Kassel

10.1163/9789004260351_004
/content/books/b9789004260351_004
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