Spörer's law

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What Wikipedia says

In solar physics, Spörer's law is an empirical law for the variation of heliographic latitudes at which solar active regions form during a solar cycle. It was discovered by the English astronomer Richard Christopher Carrington around 1861. Carrington's work was refined by the German astronomer Gustav Spörer.

Excerpt from the Wikipedia article “Spörer's law”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, Marshal Space Flight Center, Solar Physics, Public domain, via Wikimedia Commons.