Kepler’s Drawings Might Reveal When the Sunspots Disappeared
Something freaky happened to the Sun in the 17th century. Instead of the usual 11-year solar cycle of increasing and decreasing sunspot numbers, the Sun produced far fewer sunspots than normal from roughly 1645 to 1715. Because the Maunder Minimum (as it was later named) occurred toward the very beginning of the era of solar…
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