Sunspot characteristics at the onset of the Maunder Minimum based on the...
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https://data.zh-cn.virginia.gov/dataset/sunspot-characteristics-at-the-onset-of-the-maunder-minimum-based-on-the-observations-of-heveli
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An analysis of the sunspot observations made by Hevelius during 1642-1645 is presented. These records are the only systematic sunspot observations just before the Maunder...
