Tree Rings and an Ancient Diary Just Confirmed an 800-Year-Old Solar Storm
May 22, 2026A Japanese research team has pinpointed a massive solar storm that struck around 1200–1201 CE. The evidence comes from two sources: a sharp spike in carbon-14 trapped in the rings of a buried tree from northern Japan, and a line in the medieval diary of poet Fujiwara no Teika describing 'a red light in the northern sky.' An 800-year-old convergence — and a warning for today.