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1 results

  • Solar activity reconstruction from the Georg Eimmart archive of 1616 – 1720

  • Nadezhda V. Zolotova, Mikhail V. Vokhmyanin
  • Journal:
    Proceedings of the International Astronomical Union / Volume 19 / Issue S365 / December 2023
    Published online by Cambridge University Press:
    23 December 2024, pp. 355-358
    Print publication:
    December 2023
    • Article
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  • Historical sunspot records provide piece by piece more information on solar variability on a centennial scale. In this work, we analyze sunspot observations from the archives of Georg Christoph Eimmart, which is the second-richest data set of the Maunder minimum after the archives of the Paris observatory. Comparing the dates of the blank solar disk from the database by Hoyt & Schatten (1998) with dates of observations at the Eimmart observatory, we find that spotless days reports originate from astrometric observations. A comparison of the observations by La Hire and Müller of 1719 suggests that the observations by La Hire were for astrometric purposes as well, rather than aimed at sunspot counting.