How Kepler’s 400-year-old sunspot sketches helped solve a modern mystery

Ars Technica
By Jennifer OuelletteJul 31, 2024, 4:16 pm237 pts
Enlarge / A naked-eye sunspot group on May 11, 2024. There are typically 40,000 to 50,000 sunspots observed in ~11-year solar cycles. (credit: E. T. H. Teague) A team of Japanese and Belgian astronomers has re-examined the sunspot drawings made by 17th century astronomer Johannes Kepler with modern analytical…

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