The following is a list of solar cycles (sometimes called sunspot cycles), tracked since 1755.

Large geomagnetic storms are most common during the peak of the eleven year sunspot cycle or during the three years after the peak.

First, it is too dangerous for any country to come even remotely close to the point where insolvency can be triggered by a sunspot.

In 2004, a team of astronomers in Hawaii observed an extrasolar planet around the star HD 179949, which appeared to be creating a sunspot on the surface of its parent star.