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

flag 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. flag Kepler's 1607 drawings, made with a camera obscura, predate existing telescopic sunspot records from 1610.

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