Butterfly Diagram (IMAGE) University of Washington Caption The so-called "butterfly diagram" shows that sunspot activity starts farther from the sun's equator and gradually moves toward the center. The cycle repeats every 11 years. Credit Hathaway 2019/solarcyclescience.com Usage Restrictions With credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.