These 17th-century drawings of the sun by Kepler add fire to solar cycle mystery

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These 17th-century drawings of the sun by Kepler add fire to solar cycle mystery
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Elizabeth Howell (she/her), Ph.D., is a staff writer in the spaceflight channel since 2022 covering diversity, education and gaming as well. She was contributing writer for Space.com for 10 years before joining full-time.

The earliest datable sunspot drawings based on Johannes Kepler's solar observations with camera obscura in May 1607. Kepler accompanied the drawings with descriptions in Latin of the sunspots he was observing."Half-forgotten" sunspot drawings by Renaissance astronomer Johannes Kepler are showing us more about how the sun's cycle of activities work.

First, the sunspot group was at a lower latitude than previously believed ; related to that, future findings in the telescope showed sunspots at higher latitudes, suggesting"a typical transition" between cycles. But the finding is not without controversy: tree ring cycles from previous studies have suggested normal solar cycles in some work, and abnormal solar cycles in others.

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