Kepler’s 1607 pioneering sunspot sketches solve solar mysteries 400 years later

Using modern techniques, researchers have re-examined Johannes Kepler’s half-forgotten sunspot drawings and revealed previously-hidden information about the solar cycles before the grand solar minimum. Using modern techniques, researchers have re-examined Johannes Kepler’s half-forgotten sunspot drawings and revealed previously-hidden information about the solar cycles before the grand solar minimum. Planetary Sciences Phys.org – latest science and technology news stories