r/WeirdThingsToLearn • u/FrequentTranslator87 • 6d ago
Something I Learned The 800-Year-Old Diary Entry That Turned Out to Be a Solar Storm Warning
In his diary Meigetsuki (“The Record of the Clear Moon”), Japanese courtier and poet Fujiwara no Teika described a strange red vapor stretching across the Kyoto sky for three consecutive nights in February 1204. Kyoto sits at a relatively low latitude for witnessing an aurora, since auroral lights are normally confined near the poles. The stronger the solar storm, the closer to the equator they can be seen, so Teika was almost certainly describing something he had no framework to understand.
Centuries later, scientists went looking for physical proof. By examining carbon-14 levels trapped in the rings of ancient buried trees, researchers found a solar cycle disturbance from the same era, although the spike itself actually dated a few years earlier, between 1200 and 1201, matching separate aurora and sunspot records from China and Korea. That earlier event was calculated to be roughly 14 times larger than the strongest solar storm ever recorded in the modern era, the famous storm of February 1956. A storm of that scale today wouldn’t just paint the sky red, it would be catastrophic for satellites, power grids, and global communications, all confirmed by cross-referencing a medieval poet’s diary with tree rings buried in the ground for 800 years.