🔴 Analyses of Johannes Kepler’s Sunspot Drawings in 1607: A Revised Scenario for the Solar Cycles in the Early 17th Century

“Here, we make use of Kepler’s sunspot drawings and descriptive texts to identify his observational sites and time stamps. We have deprojected his sunspot drawings and compared the reported positions with our calculations of the inclination of the solar equator as seen from these sites at that time.”

Hayakawa, H. et al. (2024) ‘Analyses of Johannes Kepler’s Sunspot Drawings in 1607: A revised scenario for the solar cycles in the early 17th century,’ The Astrophysical Journal Letters, 970(2), p. L31. https://doi.org/10.3847/2041-8213/ad57c9.

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