It appears that after looking at 80 years of history between the Dow Jones Industrial Average and the number of sunspots that a clear relationship has been established between sunspot cycles and the stock market. The long and short of it is that there is a clear and now predictable pattern of human behavior associated with the 11 year sunspot cycles where when the sun cools, fear and anxiety rise leading to bear markets. Read on for proof!
Note the date of this abstract before you read it.
https://www.sciencedirect.com/science/article/pii/S0040162507001357
This article is predicting another bear market coming between now and 2020 based on the past 80 years of research.
https://economyandmarkets.com/economy/forecasts/the-fourth-cycle-sun-spots-stock-market/
Is there an unmistakable link between sunspots and the stock market.
https://www.socionomics.net/2011/09/article-the-sunspot-cycle-and-stocks/
https://agorafinancial.com/2016/07/01/the-day-the-sunspots-died/
http://www.timingsolution.com/TS/Articles/sunspot/
For your information:
The more sunspots the hotter the sun, the less spots less hot.
http://www-das.uwyo.edu/~geerts/cwx/notes/chap02/sunspots.html