It's not coincidence.
Lower sunspot activity is an indication of a lower intensity of the sun's magnetic field.
That magnetic field, when strong, shields the earth from cosmic rays.
When weak, more cosmic rays strike the earth's atmosphere, causing water molecules to condense, forming clouds.
This phenomenon can be replicated at will in a laboratory, and does not rely on unvalidated computer simulations.
The historical record shows that low sunspot activity correlates with cold/rainy weather, starvation, pestilence and death.
“The historical record shows that low sunspot activity correlates with cold/rainy weather, starvation, pestilence and death.”
And THAT is why the price of gold is cyclical with sunspot activity throughout history.