17th-century Kepler sketches provide insights into sunspot cycles and solar variability, predating existing 1610 records.

17th-century sketches by astronomer Johannes Kepler offer new insights into the sun's historical behavior, helping scientists understand sunspot cycles and the variability of the sun. Kepler's 1607 drawings, made with a camera obscura, predate existing telescopic sunspot records from 1610.

August 15, 2024
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