1610 Zürich 1750 Wolf 1848 International 1947 relative 2015 individual GSM Sunspot group Number

First published at 07:57 UTC on January 19th, 2019.

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"the" sunspot count is actually an average of observations by multiple people in multiple locations weighted by observatory factor or personal reduction coefficient as a scaling factor assigned to each observer to compensate for differ...

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CategoryEducation
SensitivityNormal - Content that is suitable for ages 13+