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oldest sunspot sketchCNN
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89% Informative
German astronomer Johannes Kepler made sketches of sunspots in 1607 from his observations of the sun’s surface.
The sun experiences an 11-year cycle of waxing and waning activity, known as the solar cycle.
Kepler 's sketches predate existing telescopic sunspot records from 1610 by several years .
Kepler sketches helped astronomers understand the Maunder Minimum, a period of extremely weak and abnormal solar cycles between 1645 and 1715 .
The background mechanism of the grand solar minimum is still debated by astronomers today .
Hayakawa and his colleagues translated Kepler ’s original report, written in Latin , to understand the exact orientation of his sunspot sketches.
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