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oldest sunspot sketchCNN
•90% Informative
German astronomer Johannes Kepler made sketches of sunspots in 1607 from his observations of the sun’s surface.
Astronomers observed sunspot spots with telescopes for the first time in 1610 .
The sun experiences an 11-year cycle of waxing and waning activity, known as the solar cycle.
Today , scientists track solar activity using data from ground and space-based observatories.
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, as well as narrow down the time range.
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