Comments on: 17th Century Sunspot Drawings Could Help Solve 400-Year-Old Solar Cycle Mystery https://spanish.lifeboat.com/blog/2024/07/17th-century-sunspot-drawings-could-help-solve-400-year-old-solar-cycle-mystery Safeguarding Humanity Tue, 30 Jul 2024 04:27:31 +0000 hourly 1 https://wordpress.org/?v=6.6.2