Kepler's 1607 Sunspot Sketches Shed Light on Early Solar Cycles
Researchers have utilized modern techniques to revisit Johannes Kepler's historic sunspot drawings from 1607, uncovering new insights into solar cycles prior to the grand solar minimum. Led by Nagoya University in Japan, the international team reexamined Kepler's observations using Sporer's law and modern statistical methods. They accurately pinpointed the sunspot group's position, identifying i